Add multiple favicon sizes and proper link tags

Adds 192x192 and 180x180 (apple-touch-icon) versions to match
www.ossuminc.com setup. Uses MkDocs Material template override
to add proper link rel tags for all icon sizes.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: respencer-ncl

docs/assets/images/apple-touch-icon.jpg

@@ -0,0 +1,7 @@
+{% extends "base.html" %}
+
+{% block extrahead %}
+  <link rel="icon" sizes="192x192" href="{{ 'assets/images/favicon-192.jpg' | url }}" type="image/jpeg"/>
+  <link rel="shortcut icon" href="{{ 'assets/images/favicon.jpg' | url }}" type="image/jpeg"/>
+  <link rel="apple-touch-icon" href="{{ 'assets/images/apple-touch-icon.jpg' | url }}" type="image/jpeg"/>
+{% endblock %}