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

docs/cheatsheet.md

@@ -0,0 +1,57 @@
+# cheatsheet
+
+quick commands for daily use.
+
+## rebuild
+
+```bash
+# poppy (macbook)
+darwin-rebuild switch --flake .#poppy
+
+# muscari (server)
+sudo nixos-rebuild switch --flake .#muscari
+```
+
+## update
+
+```bash
+# update flakes then rebuild
+nix flake update && darwin-rebuild switch --flake .#poppy
+```
+
+## check
+
+```bash
+# validate before applying
+nix flake check
+
+# dry run (see what would change)
+darwin-rebuild switch --flake .#poppy --dry-run
+```
+
+## cleanup
+
+```bash
+# remove old generations
+nix-collect-garbage -d
+
+# or with sudo on nixos
+sudo nix-collect-garbage -d
+```
+
+## shell
+
+```bash
+ll          # detailed list with icons
+cd <dir>    # actually zoxide - remembers frequent paths
+ff          # fastfetch system info
+```
+
+## navigation
+
+```bash
+cd <partial>      # zoxide - jump to frequent dir
+cd ..             # parent directory
+ctrl+r            # fzf history search
+ctrl+t            # fzf file finder
+```