docs: adding mentions of this site's source available (closing #2)

mkdocs.yml

@@ -16,16 +16,19 @@ theme:
     accent: amber
 
 extra:
- social:
-   - icon: simple/mastodon
-     link: https://bubbler.jakest.us/@jt
-     name: Follow me on Mastodon
-   - icon: simple/matrix
-     link: https://matrix.to/#/@jt:neo.jakest.us
-     name: Chat with me on Matrix
-   - icon: simple/forgejo
-     link: https://git.jakest.us
-     name: My codings on git
+  social:
+    - icon: simple/mastodon
+      link: https://bubbler.jakest.us/@jt
+      name: Follow me on Mastodon
+    - icon: simple/matrix
+      link: https://matrix.to/#/@jt:neo.jakest.us
+      name: Chat with me on Matrix
+    - icon: simple/forgejo
+      link: https://git.jakest.us
+      name: My codings on git
+    - icon: simple/git
+      link: https://git.jakest.us/jt/saitti
+      name: Website source code
 extra_css:
   - extra.css
 markdown_extensions: