docs: add product docs and screenshots

docs/index.md

@@ -2,7 +2,8 @@
 
 **eBay trust scoring before you bid.**
 
-![Snipe landing hero](screenshots/01-hero.png)
+![Snipe landing hero](screenshots/01-hero.png){ .only-light }
+![Snipe landing hero](screenshots/01-hero-dark.png){ .only-dark }
 
 Snipe scores eBay listings and sellers for trustworthiness before you place a bid. Paste a search query, get results with trust scores, and know exactly which listings are worth your time.
 
@@ -16,7 +17,8 @@ Snipe scores eBay listings and sellers for trustworthiness before you place a bi
 
 ## How it works
 
-![Search results with trust scores](screenshots/02-results.png)
+![Search results with trust scores](screenshots/02-results.png){ .only-light }
+![Search results with trust scores](screenshots/02-results-dark.png){ .only-dark }
 
 Each listing gets a composite trust score from 0–100 based on five seller signals: account age, feedback count, feedback ratio, price vs. market, and category history. Red flags are surfaced alongside the score, not buried in it.
 

mkdocs.yml

@@ -31,6 +31,7 @@ theme:
 
 markdown_extensions:
   - admonition
+  - attr_list
   - pymdownx.details
   - pymdownx.superfences:
       custom_fences:
@@ -61,6 +62,7 @@ nav:
     - Trust Score Algorithm: reference/trust-scoring.md
     - Tier System: reference/tier-system.md
     - Architecture: reference/architecture.md
+  - All CF Docs: https://docs.circuitforge.tech
 
 extra_css:
   - stylesheets/theme.css