diff --git a/flake.lock b/flake.lock
index f2e254c..4e566d2 100644
--- a/flake.lock
+++ b/flake.lock
@@ -32,6 +32,22 @@
         "type": "github"
       }
     },
+    "mermaid": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1719905309,
+        "narHash": "sha256-pGjfHnIJ7QPVWN+XZZl63c535fuegyb6/EL+UmGhTQg=",
+        "owner": "hugomods",
+        "repo": "mermaid",
+        "rev": "c0c313df723dbac0e5dad65cb4794f5987b81d3b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hugomods",
+        "repo": "mermaid",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1728018373,
@@ -52,6 +68,7 @@
       "inputs": {
         "hugo-modules": "hugo-modules",
         "hugoplate": "hugoplate",
+        "mermaid": "mermaid",
         "nixpkgs": "nixpkgs"
       }
     }
diff --git a/flake.nix b/flake.nix
index ee35e5f..4d8ecdd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,10 +3,12 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     hugoplate.url = "github:zeon-studio/hugoplate";
     hugoplate.flake = false;
+    mermaid.url = "github:hugomods/mermaid";
+    mermaid.flake = false;
     hugo-modules.url = "github:gethugothemes/hugo-modules";
     hugo-modules.flake = false;
   };
-  outputs = inputs@{ self, nixpkgs, hugoplate, ... }:
+  outputs = inputs@{ self, nixpkgs, ... }:
     let
       system = "x86_64-linux";
       lib = nixpkgs.lib;
@@ -15,26 +17,44 @@
     {
       packages.${system}.default =
         let
+          lockfile = with builtins; (fromJSON (readFile ./flake.lock)).nodes;
+          module-sources = map
+            (x: {
+              source = inputs.${x};
+              path = with lockfile.${x}.original; "${type}.com/${owner}/${repo}";
+            })
+            ([
+              "hugo-modules"
+              "mermaid"
+            ]);
           theme = "hugoplate";
-          modules = with builtins; map (attrs: baseNameOf attrs.path) (fromTOML (readFile ./src/config/_default/module.toml)).imports;
         in
         pkgs.stdenv.mkDerivation
           {
             name = "website";
             src = ./src;
-            buildInputs = with pkgs; [ go nodejs git ];
-            buildPhase = ''
-              # install theme
-              mkdir -p themes/${theme}
-              cat << EOF >> hugo.toml
-              theme = "${theme}"
-              EOF
-              cp -r ${inputs.${theme}}/* themes/${theme}
-              # install modules
-              mkdir -p themes/github.com/gethugothemes/hugo-modules
-              cp -r ${toString (map (module: "${inputs.hugo-modules}/${module}") modules)} themes/github.com/gethugothemes/hugo-modules/
-              ${lib.getExe pkgs.hugo} --minify --logLevel info -d public
-            '';
+            buildInputs = with pkgs; [ go nodejs git tree ];
+            buildPhase =
+              let
+                copy-modules = map
+                  (module: ''
+                    mkdir -p themes/${module.path}
+                    cp -r ${module.source}/* themes/${module.path}
+                  '')
+                  module-sources;
+              in
+              lib.concatStringsSep "\n" copy-modules +
+              ''
+                # install theme
+                mkdir -p themes/${theme}
+                cat << EOF >> hugo.toml
+                theme = "${theme}"
+                EOF
+                cp -r ${inputs.${theme}}/* themes/${theme}
+
+                tree .
+                ${lib.getExe pkgs.hugo} --minify --logLevel info -d public
+              '';
             installPhase = "cp -r public $out";
           };
       devShells.${system}.default =
diff --git a/src/config/_default/module.toml b/src/config/_default/module.toml
index d33813c..5493e74 100644
--- a/src/config/_default/module.toml
+++ b/src/config/_default/module.toml
@@ -2,92 +2,92 @@
 extended = true
 min = "0.115.2"
 
-# [[imports]]
-# path = "github.com/zeon-studio/hugoplate"
+[[imports]]
+path = "github.com/hugomods/mermaid"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/search"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/search"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/pwa"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/pwa"
 
 [[imports]]
 path = "github.com/gethugothemes/hugo-modules/images"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/videos"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/videos"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/icons/font-awesome"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/icons/font-awesome"
 
-# [[imports]]
-# path = "github.com/gethugothemes/hugo-modules/icons/themify-icons"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/icons/themify-icons"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/gzip-caching"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/gzip-caching"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/adsense"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/adsense"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/accordion"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/accordion"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/table-of-contents"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/table-of-contents"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/tab"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/tab"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/modal"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/modal"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/gallery-slider"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/gallery-slider"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/components/preloader"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/components/preloader"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/components/social-share"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/components/social-share"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/components/cookie-consent"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/components/cookie-consent"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/components/custom-script"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/components/custom-script"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/components/render-link"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/components/render-link"
 
-# [[imports]]
-# path = "github.com/gethugothemes/hugo-modules/components/valine-comment"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/components/valine-comment"
 
-# [[imports]]
-# path = "github.com/gethugothemes/hugo-modules/components/crisp-chat"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/components/crisp-chat"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/shortcodes/button"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/shortcodes/button"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/shortcodes/notice"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/shortcodes/notice"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/seo-tools/basic-seo"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/seo-tools/basic-seo"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/seo-tools/site-verifications"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/seo-tools/site-verifications"
 
-#[[imports]]
-#path = "github.com/gethugothemes/hugo-modules/seo-tools/google-tag-manager"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/seo-tools/google-tag-manager"
 
-# [[imports]]
-# path = "github.com/gethugothemes/hugo-modules/seo-tools/baidu-analytics"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/seo-tools/baidu-analytics"
 
-# [[imports]]
-# path = "github.com/gethugothemes/hugo-modules/seo-tools/matomo-analytics"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/seo-tools/matomo-analytics"
 
-# [[imports]]
-# path = "github.com/gethugothemes/hugo-modules/seo-tools/plausible-analytics"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/seo-tools/plausible-analytics"
 
-# [[imports]]
-# path = "github.com/gethugothemes/hugo-modules/seo-tools/counter-analytics"
+[[imports]]
+path = "github.com/gethugothemes/hugo-modules/seo-tools/counter-analytics"
diff --git a/src/config/_default/params.toml b/src/config/_default/params.toml
index eb0b0a7..b13f399 100755
--- a/src/config/_default/params.toml
+++ b/src/config/_default/params.toml
@@ -62,14 +62,6 @@ author = "NGI Fediversity"
 image = "images/logo.png"
 
 
-# site verifications
-# verification module: https://github.com/gethugothemes/hugo-modules/tree/master/seo-tools/site-verifications
-[site_verification]
-google = ""   # Your verification code
-bing = ""     # Your verification code
-baidu = ""    # Your verification code
-facebook = "" # Your verification code
-mastodon = "" # Your verification code
 
 # cookies
 # cookies module: https://github.com/gethugothemes/hugo-modules/tree/master/components/cookie-consent