Change zsh theme

Custom theme is very minimal and has little info about your whereabouts
on the server. "bira" theme set as default.

Custom theme wasn't removed, just commented-out.

README.md

@@ -18,12 +18,15 @@ cd ~/server_cli_tools
 | # | Component | What it does |
 |---|-----------|-------------|
 | 1 | **Core packages** | `vim`, `bat`, `eza`, `fzf`, `htop`, `tmux`, `zsh`, `ripgrep`, `fd-find`, `zoxide`, `git-delta` |
-| 2 | **Zsh + Oh-My-Zsh** | Shell, plugins (`zsh-autosuggestions`, `zsh-syntax-highlighting`, `z`), custom prompt theme |
+| 2 | **Zsh + Oh-My-Zsh** | Shell, plugins (`zsh-autosuggestions`, `zsh-syntax-highlighting`, `z`), `bira` prompt theme |
 | 3 | **Aliases + tools** | General, git, and docker aliases with a self-documenting help system (`h`) |
 | 4 | **Terminal configs** | `bat` theme (base16) |
 | 5 | **Docker** | `docker.io` via apt, service enabled, user added to `docker` group, management aliases |
 | 6 | **Git config** | `git-delta` as pager with side-by-side diffs |
 
+> **NOTE:** There's minimal custom theme in `<repo>/configs/zsh/zhann-elvis.zsh-theme`. To apply it toggle `ZSH_THEME` and uncomment sourcing it in `~/.zshrc` after install.
+> For more themes, see [Oh-My-Zsh themes](https://github.com/ohmyzsh/ohmyzsh/wiki/themes).
+
 ## Alias highlights
 
 Type `h` after installation to see all aliases with descriptions. Some highlights:
@@ -63,8 +66,7 @@ server_cli_tools/
     custom_tools/
       backup_dotfiles.sh        # backup conflicting dotfiles
     bat/config                  # bat theme
-    zsh/zhann-elvis.zsh-theme   # custom zsh prompt (git-aware)
-    zshrc                       # .zshrc with oh-my-zsh + plugins
+    zshrc                       # .zshrc with oh-my-zsh, bira theme, plugins
 ```
 
 ## Customization