docs: add product docs and screenshots

docs/index.md

@@ -10,13 +10,15 @@ Try it: [pagepiper.circuitforge.tech](https://pagepiper.circuitforge.tech)
 
 ### Library
 
-![Library view](screenshots/01-library.png)
+![Library view](screenshots/01-library.png){ .only-light }
+![Library view](screenshots/01-library-dark.png){ .only-dark }
 
 Scan your PDF directory to index documents, or upload individual PDFs directly. Each document shows page count and shelving status.
 
 ### Chat
 
-![Chat view](screenshots/02-chat.png)
+![Chat view](screenshots/02-chat.png){ .only-light }
+![Chat view](screenshots/02-chat-dark.png){ .only-dark }
 
 Ask questions across your indexed documents. Results cite the source document and page number.
 

mkdocs.yml

@@ -31,6 +31,7 @@ theme:
 
 markdown_extensions:
   - admonition
+  - attr_list
   - pymdownx.details
   - pymdownx.superfences:
       custom_fences:
@@ -59,6 +60,7 @@ nav:
     - Architecture: reference/architecture.md
     - Tier System: reference/tier-system.md
     - Environment Variables: reference/environment-variables.md
+  - All CF Docs: https://docs.circuitforge.tech
 
 extra_css:
   - stylesheets/theme.css