refactor: standardize shell aliases and remove Bitwarden login helpers

Remove the custom `bw_login` function/alias from Nushell, bash, and PowerShell configurations as it's no longer needed. Expand PowerShell profile with comprehensive git aliases matching bash conventions, add clipboard navigation helper (`cdp`), and enable chezmoi completions.

home/executable_dot_bash_aliases.tmpl

@@ -33,7 +33,6 @@ alias suggest='gh copilot suggest -t shell'
 alias spt='spotify_player'
 alias gitalias='alias | grep "git "'
 alias mousefix='sudo udevadm trigger' # helped with mouse issues on laptop
-alias bw_login='export BW_SESSION=$(bw unlock --raw)'
 
 # Clipboard aliases
 {{ if not .wsl -}}