refactor(mini.nvim): replace manual bootstrap with vim.pack.add

Use Neovim's built-in package manager instead of manual git clone for
mini.nvim installation. Remove stale commented-out add() calls and
reorder requires. Also add fish alias for launching mini.nvim.

config/fish/config.fish

@@ -54,6 +54,7 @@ if status is-interactive
         alias oo="cd ~/Documents/nca-notes/"
         alias on="nvim +Obsidian new"
         alias os="nvim +Obsidian search"
+        alias mini="NVIM_APPNAME=mini.nvim nvim"
     end
 
     command -q jj && alias rev "jj log -G -T 'commit_id.short(8)'"