docs(docs): add vicinae documentation and update references

docs/terminal/ghostty.mdx

@@ -7,10 +7,12 @@ Ghostty is only a [tmux](/terminal/tmux) client. tmux owns tabs (windows), split
 
 | | |
 | --- | --- |
-| Source | `dot_config/ghostty/config`, `dot_config/ghostty/config.ghostty`, `dot_config/ghostty/themes/` |
+| Source | [prdlk/ghostty](https://github.com/prdlk/ghostty) via `.chezmoiexternals/ghostty.toml`: `config`, `config.ghostty`, `themes/` |
 | Target | `~/.config/ghostty/` |
 | Install | Not listed in `.chezmoidata/packages.yaml`; install separately |
 
+`~/.config/ghostty` is a `git-repo` external checkout, not chezmoi-managed contents; edit it in place and commit and push from there.
+
 Ghostty reads both `config` and `config.ghostty`. `config` holds all settings; `config.ghostty` contains a single line, `theme = cyberdream`, which selects the active theme.
 
 ## Options
@@ -72,7 +74,7 @@ Closing a window only detaches its session; the shells keep running in the tmux
 | `ctrl+shift+tab` / `ctrl+page_up` / `ctrl+shift+left` / `ctrl+shift+h` | `prefix p` | Previous window |
 | `ctrl+shift+l` | `prefix v` | Split right |
 | `ctrl+shift+j` | `prefix h` | Split below |
-| `ctrl+shift+o` | `prefix o` | Session picker (tmux-sessionx) |
+| `ctrl+shift+o` / `super+enter` | `prefix o` | Sessions palette: switch session or window, or create one through zoxide |
 | `ctrl+shift+x` | `prefix x` | Kill pane |
 | `ctrl+shift+enter` / `ctrl+shift+z` | `prefix z` | Zoom pane |
 | `ctrl+shift+page_up` | `prefix [` | Copy mode |