Properly initialize wiki pages

**Is your feature request related to a problem? Please describe.**
Wiki pages for this project are spread across multiple repositories. Because of this, duplicate wiki pages (such as the style-guide) will only contain a link to the original wiki page.

**Describe the solution you'd like**
Copy and paste the contents of all non-project specific wiki pages to the corresponding wiki pages in the `.github` repository. If the page doesn't exist in the `.github` repository, create it! Any project specific wiki pages should remain in their repo's wiki.