Link check documentation

[martin-nordberg]

This is probably a down-the-road sort of issue:

In my first use of Herd I managed to upload and publish the module-doc without its .resources subfolder.

Suggested improvements:

• Make it more obvious that the user should browse the upload before clicking "Publish"
• Check HTML links in the documentation and return an error or warning for broken links.

[FroMage]

We can certainly check the published docs more, including checking for .resources, but how did this happen exactly? Did you upload by zip perhaps?

Checking the links for each HTML file is something we could do, but only produce warnings.

[martin-nordberg]

Yes, uploaded by zip, which was missing the sub folder at first.