Revert "Moves anchor_headings.html to _includes"

This reverts commit 948f6fc.

.github/workflows/update_jekyll-anchor-heading.yml

@@ -23,7 +23,7 @@ jobs:
         uses: suisei-cn/[email protected]
         with:
           url: "https://github.com/allejo/jekyll-anchor-headings/releases/download/${{ steps.latest-release.outputs.release }}/anchor_headings.html"
-          target: _includes/
+          target: _includes/vendor/
 
       - name: Create PR
         uses: peter-evans/create-pull-request@v4
@@ -33,11 +33,11 @@ jobs:
           body: |
             Update `jekyll-anchor-headings` to `${{ steps.latest-release.outputs.release }}`
             This is an automated pull request.
-          branch: update/jekyll-anchor-headings
+          branch: update/vendor/jekyll-anchor-headings
           delete-branch: true
           labels: |
             kind/update
             area/dependency
           add-paths: |
-            _includes/anchor_headings.html
+            _includes/vendor/anchor_headings.html
           token: ${{ secrets.GITHUB_TOKEN }}

_layouts/default.html

@@ -23,7 +23,7 @@
       <div id="main-content" class="main-content">
         <main>
           {% if site.heading_anchors != false %}
-            {% include anchor_headings.html html=content beforeHeading="true" anchorBody="<svg viewBox=\"0 0 16 16\" aria-hidden=\"true\"><use xlink:href=\"#svg-link\"></use></svg>" anchorClass="anchor-heading" anchorAttrs="aria-labelledby=\"%html_id%\"" %}
+            {% include vendor/anchor_headings.html html=content beforeHeading="true" anchorBody="<svg viewBox=\"0 0 16 16\" aria-hidden=\"true\"><use xlink:href=\"#svg-link\"></use></svg>" anchorClass="anchor-heading" anchorAttrs="aria-labelledby=\"%html_id%\"" %}
           {% else %}
             {{ content }}
           {% endif %}