This way, we'll get build-time errors if we've moved a page around and haven't fixed the link, and it ensures a trailing `/` is present in the generated URL, which avoids unnecessary redirect S3 redirect hops.
Instead, use `relref` links. That way, we can catch any issues if we
move a page to a different URL. Also, prefer `https` rather than `http`
for links to other Pulumi sites.
Note: This does not change any links to www.pulumi.com in autogenerated
content (such as API docs and tutorials).
* 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
