refactor: use michaotic username throughout, add cli/kitty/zsh configs and docs

docs/shell.md

@@ -0,0 +1,41 @@
+# shell
+
+zsh configuration across all hosts.
+
+## prompt
+
+**pure** - minimal, fast, shows git status.
+- green `>` on success
+- red `>` on error
+- right prompt: current time in gray
+
+## plugins
+
+| plugin | source | purpose |
+|--------|--------|---------|
+| pure | github (v1.23.0) | prompt theme |
+| zsh-syntax-highlighting | nixpkgs | command coloring |
+| zsh-autosuggestions | nixpkgs | gray command hints |
+
+## history
+
+- size: 10000
+- shared between sessions
+- ignores duplicates
+- stored in `~/.local/share/zsh/history` (xdg)
+
+## universal aliases
+
+| alias | what |
+|-------|------|
+| `ll` | `eza -l --icons --git` |
+| `la` | `eza -la --icons --git` |
+| `ff` | `fastfetch` |
+
+## startup
+
+fastfetch runs automatically when opening new shell.
+
+## host-specific
+
+see `docs/poppy.md` and `docs/muscari.md` for per-host aliases (nix rebuild commands differ).