fix(formatting): Using alejandra

- Removed `compinit` call
- Stopped loading ohmyzsh/ohmyzsh path:lib
- Turned off p10k instant prompt

zsh.nix

@@ -75,8 +75,7 @@
 
       initExtraFirst = ''
         # Basic auto/tab complete:
-        ZSH_COMPDUMP="$ZSH_CACHE/.zcompdump-''${SHORT_HOST}-''${ZSH_VERSION}"
-        autoload -U compinit -d ''${ZSH_COMPDUMP}
+        autoload -U compinit
         zstyle ':completion:*' menu select
         zmodload zsh/complist
         _comp_options+=(globdots)               # Include hidden files.