doc: Add edit URL to pages

Author: srid

doc/index.yaml

@@ -12,6 +12,7 @@ template:
   sidebar:
     collapsed: false
   urlStrategy: pretty
+  editBaseUrl: https://github.com/srid/haskell-flake/edit/master/doc
 
 pandoc:
   rewriteClass:

doc/templates/hooks/after-note.tpl

@@ -0,0 +1,13 @@
+<div class="flex items-center justify-center mt-2">
+  <ema:metadata>
+    <with var="template">
+      <a class="text-gray-300 hover:text-${theme}-600 text-sm" title="Edit this page on GitHub"
+        href="${value:editBaseUrl}/${ema:note:source-path}">
+        <svg xmlns="http://www.w3.org/2000/svg" class="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
+            d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z" />
+        </svg>
+      </a>
+    </with>
+  </ema:metadata>
+</div>