Fix anchors

.gitignore

@@ -0,0 +1 @@
+Gemfile.lock

docs/_config.yml

@@ -1,5 +1,5 @@
 theme: jekyll-theme-cayman
-gems:
+plugins:
   - jekyll-sitemap
   - jekyll-seo-tag
   - jekyll-redirect-from

docs/_layouts/default.html

@@ -32,14 +32,14 @@
 </section>
 
 <section class="main-content">
-{% include anchor_headings.html html=content anchorBody="#" %}
+{% include anchor_headings.html html=content anchorBody="#" beforeHeading=true %}
 
-    <amp-user-notification id="my-notification" layout="nodisplay">
+<amp-user-notification id="my-notification" layout="nodisplay">
     <div>
         This site uses cookies, as described in the <a href="https://www.iubenda.com/privacy-policy/44137529/cookie-policy" target="_blank">cookie policy</a>. By clicking on "Accept" you consent to the use of cookies.
         <button on="tap:my-notification.dismiss" class="ampstart-btn caps ml1">Accept</button>
     </div>
-    </amp-user-notification>
+</amp-user-notification>
 <footer class="site-footer">
 {% if site.github.is_project_page %}
 <span class="site-footer-owner"><a href="{{ site.github.repository_url }}">{{ site.github.repository_name }}</a> is maintained by <a href="{{ site.github.owner_url }}">{{ site.github.owner_name }}</a>.</span>