The main branch is being renamed from master->main. This commit should
update all references to the main branch to the new name.
Co-Authored-By: Mike Morris <mikemorris@users.noreply.github.com>
* website: migrate to new nav-data format
* website: clean up unused intro content
* website: remove deprecated sidebar_title from frontmatter
* website: add react-content to fix global style import issue
