* Add _ to dogfood docs folder to cover against edge case
* Fix edge case with MDX partials when site / content dir contains a _ prefix
* add globUtils tests
* proper dogfooding folder re-organization, all content plugins being used
* refactor dogfooding folder + expose /tests page index
* fix page plugin ignoring options.routeBasePath
* create a swizzleWarning partial for shared text
* Generalize usage of _ prefix convention to exclude content files/folders
* add api doc
* MDX loader should not expect metadata/frontmatter on MDX partial files