v0.2.0

[aaronw22]

Describe your changes

Adding the new features in Jack and Elyse's PRs to the v0.2.0 release of theme61.

Do the following before requesting a review

• [x] I have written tests covering functions I have added or changed.
• [x] I have run tests and they all pass.
• [x] I have updated the package documentation with devtools::document().
• [x] I have updated the package website with pkgdown::build_site_github_pages()