Minor update docs

[jkikstra]

Updates:

• README
• Documentation
  • Zenodo for climate-assessment code
  • package name
  • paper citation

[jkikstra]

Changelog is now in #1, don't want to double create that here. We can fix that later (since already #3 has been merged in also), or first do #1 and after that this one.

[znicholls]

Or skip changelog for this PR given how small it is

[phackstock]

Since this PR just contains minor docs updates, I'd side with @znicholls and say we can skip the changelog. In general I'd say it should be reserved for more functionality related updates.

[znicholls]

Yep or at least let's not block this PR for such a small thing

[jkikstra]

Since I addressed @phackstock's comments, and this is very small (just docs) and easy to change later, I will merge it in.