Add description for skill and knowledge

[cooktheryan]

It would be beneficial to users to understand a breakdown of what a knowledge and skill contribution are before choosing which one to submit. I think this could go right below the "Knowledge Contribution Form" or "Skill Contribution Form" that way a new user knows which is the proper one to submit.

[aevo98765]

I could take this one. I can't assign issues to myself at the moment though.

[nerdalert]

@cooktheryan @aevo98765 ty to you both for this!

[nerdalert]

Resolved in #38