Changes usage of `ref` (fully qualified URL) to `relref` (relative URL), as there's no need for these to be fully qualified and we generally use `relref` throughout.
* Add markdown linting script; fix markdown lint errors
* Add support for meta description and page title validation
* Add comments
* Fix lint errors; exclude autogenerated tutorials
* Address feedback; add more comments
* Add more checks for redirect pages; no index; and auto generated content
* More fixes for lint errors
* Allow duplicate headings in a page
* More lint error fixes
* Even more lint error fixes
* Getting started guide lint fixes
* Add custom h1 support to docs single pages
* Use custom h1 tags on cloud getting started guides
* Add custom h1 support to docs
* Add custom h1 support to docs lists.html
* Final round of intial lint fixes
* Add markdown linting to build script
* Update README
* Test build failure due to lint error
* Fix lint error so build will pass
* Readability fixes for lint script
