Add announcement banner

Author: zlovatt

mkdocs.yml

@@ -90,6 +90,7 @@ theme:
     name: material
     custom_dir: overrides
     features:
+        - announce.dismiss
         - content.action.edit
         - content.action.view
         - search.highlight

overrides/main.html

@@ -0,0 +1,15 @@
+{% extends "base.html" %}
+
+{% block announce %}
+  Welcome to the new scripting guide!
+
+  This is a work in progress.
+
+  Please provide all feedback via
+  <a ref="me" href="https://github.com/orgs/docsforadobe/discussions">
+    <span class="twemoji">
+      {% include ".icons/octicons/comment-discussion-16.svg" %}
+    </span>
+    <strong>the org's discussion forum</strong>
+  </a>.
+{% endblock %}