Remove calendar tooling (vdirsyncer, khal, calsync)

Calendar handling left to phone. Mail-only setup going forward.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

laptop/.zshrc

@@ -20,7 +20,6 @@ export PATH="$HOME/.local/bin:$HOME/.cargo/bin:$HOME/go/bin:$HOME/.local/bin:$PA
 # Aliases
 alias e="emacsclient -t -a \"\""
 alias mailsync="mbsync -a"
-alias calsync="vdirsyncer sync"
 alias c="clear"
 alias cat="bat --paging=never --style=plain"
 alias cp="cp -riv"