improve docs header, nav and social cards

docs/configs/index.md

@@ -1,6 +1,7 @@
 ---
 title: Configuration
 description: Homepage Configuration
+icon: material/cog
 ---
 
 Homepage uses YAML for configuration, YAML stands for "YAML Ain't Markup Language.". It's a human-readable data serialization format that's a superset of JSON. Great for config files, easy to read and write. Supports complex data types like lists and objects. **Indentation matters.** If you already use Docker Compose, you already use YAML.