doc: add comment

fixes #192

docs/overrides/partials/comments.html

@@ -0,0 +1,5 @@
+<script src="https://giscus.app/client.js" data-repo="evan361425/flutter-pos-system"
+  data-repo-id="MDEwOlJlcG9zaXRvcnkzMjYzMTMwOTY=" data-category="Announcements" data-category-id="DIC_kwDOE3MkiM4CAUfE"
+  data-mapping="pathname" data-strict="0" data-reactions-enabled="1" data-emit-metadata="0" data-input-position="bottom"
+  data-theme="preferred_color_scheme" data-lang="en" data-loading="lazy" crossorigin="anonymous" async>
+  </script>

mkdocs.yaml

@@ -22,6 +22,7 @@ nav:
 theme:
   name: material
   language: "en"
+  custom_dir: docs/overrides
   features:
   - search.suggest
   - search.highlight
@@ -56,6 +57,10 @@ markdown_extensions:
     # 增加 anchor
     permalink: true
     toc_depth: 3
+    # 重新命名
+    slugify: !!python/object/apply:pymdownx.slugs.slugify
+      kwds:
+        case: lower
 # 允許增加 tooltip，於 MD 檔下方中增加下列說明
 # *[Text]: Description
 - abbr