docs: add dismissible announcement banner (#2243)

Add an announcement banner to the docs site using MkDocs Material announce
block and announce.dismiss feature. The banner displays open source PR Agent
documentation with a link to Qodo free version, and can be dismissed by the user.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: naorpeled

docs/docs/css/custom.css

@@ -84,7 +84,7 @@
 
 .md-header__title {
     font-size: 20px;
-    margin-left: 0px !important;
+    margin-left: 12px !important;
 }
 
 .md-header__button.md-logo,

docs/mkdocs.yml

@@ -61,6 +61,7 @@ theme:
     - content.tabs.link
     - content.code.annotation
     - content.code.copy
+    - announce.dismiss
   language: en
   custom_dir: overrides
 
@@ -90,7 +91,6 @@ plugins:
   - glightbox
 
 extra:
-  announcement: "Open-source PR Agent documentation. For the Qodo free version, [Get Started](https://www.qodo.ai/get-started/)."
   generator: false
   social:
     - icon: fontawesome/brands/github

docs/overrides/main.html

@@ -1,5 +1,9 @@
 {% extends "base.html" %}
 
+{% block announce %}
+  Open source PR Agent documentation. For the Qodo free version, Get Started: <a href="https://www.qodo.ai/get-started/">https://www.qodo.ai/get-started/</a>
+{% endblock %}
+
 {% block scripts %}
   {{ super() }}