Add support for Sidekick Icons

[Tuxii]

Hello,

Thank you for your work on rails_icons.

Heroicons is great but is missing some useful icons (where's the icon for h4 or for text-align center ?).
I heard about SidekickIcons that adds those missing icons to Heroicons.

Would you consider supporting this library ?

Thanks

[eelcoj]

First time seeing an extension to a library. I've mostly trouble how to list it within rails_icons. But let's see if we can find a nice way.

I see some useful icons in their though for most SaaS apps.

If you want to take a stab: using https://github.com/Rails-Designer/rails_icons/blob/main/lib/rails_icons/configuration/heroicons.rb as a base is easiest, than require it here https://github.com/Rails-Designer/rails_icons/blob/main/lib/rails_icons/libraries.rb and you should be good. 👍

[eelcoj]

Closing, but looking forward to that PR!