add outdated block to docs

overrides/main.html

@@ -1,6 +1,15 @@
-{% extends "base.html" %} {% block extrahead %}
+{% extends "base.html" %}
+
+{% block extrahead %}
 <meta
     http-equiv="Content-Security-Policy"
     content="default-src 'self'; script-src 'self' 'wasm-unsafe-eval'; script-src-elem 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline' fonts.googleapis.com; img-src 'self' data: github.com raw.githubusercontent.com *.s3.amazonaws.com img.youtube.com invidget.switchblade.xyz cdn.jsdelivr.net; font-src 'self' data: fonts.gstatic.com; connect-src 'self' api.github.com;frame-ancestors 'none'; form-action 'self'; upgrade-insecure-requests;"
 />
 {% endblock %}
+
+{% block outdated %}
+  You're not viewing the latest version.
+  <a href="{{ '../' ~ base_url }}">
+    <strong>Click here to go to latest.</strong>
+  </a>
+{% endblock %}