Remove clip, clipcopy, pbcopy and clipboard aliases

[Slackadays]

I'm searching GitHub for all mentions of xclip and I found your dotfiles. I noticed in line 22 of your aliases, there's a few aliases for clip, clipcopy, pbcopy, and clipboard. I wanted to suggest my project Clipboard which would let you eliminate all of those and just have cb instead to make it simpler for you to remember everything. Additionally, it would work the same way across Linux, macOS, and Windows. I hope you find my suggestion helpful! :)