docs(docs): add vicinae documentation and update references

docs/chezmoi/index.mdx

@@ -107,7 +107,7 @@ chezmoi encodes target names and attributes in source file names. These are the
 | `executable_` | Target gets the executable bit | 44 files: every script in `dot_local/bin/` (including `executable_tmux-niri-title`) and `dot_config/niri/scripts/` |
 | `exact_` | Directory is exact: entries in the target that are not in the source are deleted | `dot_config/niri/exact_config.d/` (numbered `10-…kdl` through `95-…kdl` fragments) |
 | `empty_` | File is kept even when empty | `dot_config/herdr/empty_dot_plugins.lock` |
-| `symlink_` | Target is a symlink; file content is the link destination | `dot_config/kitty/symlink_current-theme.conf` (→ `themes/cyberdream.conf`) |
+| `symlink_` | Target is a symlink; file content is the link destination | None currently |
 | `.tmpl` | Rendered with Go templates and chezmoi data | `dot_gitconfig.tmpl`, `dot_config/shell/aliases.sh.tmpl`, all scripts, the config and ignore files |
 | `run_once_` / `run_onchange_` + `before_` / `after_` | Script, with run frequency and phase | See [Apply scripts](/chezmoi/scripts) |
 
@@ -119,7 +119,7 @@ Prefixes stack in chezmoi's fixed order, e.g. `private_dot_foo`, `executable_dot
 
 What that means in practice:
 
-- Editing a plain file in `$HOME` (for example `~/.config/kitty/kitty.conf`) edits `~/.local/share/chezmoi/dot_config/kitty/kitty.conf` directly. The change is live and shows up in `git status` of the repo with no `chezmoi add` step.
+- Editing a plain file in `$HOME` (for example `~/.config/niri/config.kdl`) edits `~/.local/share/chezmoi/dot_config/niri/config.kdl` directly. The change is live and shows up in `git status` of the repo with no `chezmoi add` step.
 - Templates are rendered copies. Editing `~/.gitconfig` or `~/.config/shell/aliases.sh` changes only the copy; the next `chezmoi apply` overwrites it. Edit the `.tmpl` source (`chezmoi edit ~/.gitconfig`) instead.
 - `private_` and `executable_` targets are real files too. After editing one in place, run `chezmoi re-add <path>` to copy it back into the source.
 - Tools that rewrite their own config write through the symlink into the repo. The runtime state that would otherwise pollute the source (plugin dirs, lock files, `fish_variables`, `__pycache__`) is excluded in `.chezmoiignore.tmpl` and `.gitignore`; see [Externals and ignore rules](/chezmoi/externals-and-ignore).