Add pbcopy

[so0k]

A simple trick to make transition from MacOS to Omakub even smoother

Not sure if it's already there or there's another (undocumented) way in omakub?

else something like this?

• add xclip to install/terminal/libraries.sh
• add pbcopy alias "xclip -sel clip" to defaults/bash/aliases

[so0k]

alternatively, point me to the docs (maybe it fits in https://manual.omakub.org/1/read/34/clipboard)

in case Zellij or alacritty have a special way to handle this

[horvay]

I needed to install xclip to copy an entire txt file from nvim. Otherwise gg"+yG doesn't work :(

[horvay]

I submitted #282 in case it is wanted in the master repo 😄