docs: slim README to overview+docs pointer; expand offline manual

- README now contains only Overview, Documentation, Installation,
  Personalization, Attribution, and License; all detailed reference
  content has been removed since it is covered in the wiki
- Add Documentation section above Installation pointing to docs/wiki/
- docs/fish-config.md: add §4.11 Shell Aliases (navigation dots, color
  overrides, safety wrappers, archives, system logs)
- docs/fish-config.md: add Prompt and Theme subsection to §7 with
  Starship OSC 133 marker detail and FZF Catppuccin color values
- Regenerate docs/wiki/ with all new content

docs/wiki/3-key-bindings.md

@@ -40,10 +40,13 @@ are active in Insert, Normal, and Visual modes unless noted.
                     line to open an fzf picker and insert a selection
                     at the cursor position.
 
-## FZF Bindings (from fzf --fish integration)
+## FZF Bindings (from PatrickF1/fzf.fish)
 
-    Ctrl+R          Search shell history with fzf
-    Ctrl+T          Insert a file path from fzf
-    Alt+C           cd into a directory chosen with fzf
+    Ctrl+R          Search command history
+    Ctrl+Alt+F      Search git-tracked files
+    Ctrl+Alt+L      Search git log
+    Ctrl+Alt+S      Search git status
+    Ctrl+V          Search shell variables
+    Ctrl+Alt+P      Search running processes
 
 ---