Issue 508: Fixing broken links

[joewxboy]

Pull Request Template

Description

Fixed broken links. Two of them were caused by a combination of relative links changing the starting directory/folder when we switched to pretty URLs.

Fixes #508

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

...

Checklist:

• My code follows the style guidelines of this project
• I have checked my code and corrected any misspellings
• I have tagged the reviewers in a comment below incase my pull request is ready for a review
• I have signed the commit message to agree to Developer Certificate of Origin (DCO) (to certify that you wrote or otherwise have the right to submit your contribution to the project.) by adding "--signoff" to my git commit command.

@johnwalicki Edited pages, updated modified date, modified GHA config file to exclude http URLs.

[johnwalicki]

Thanks for the link fixes. I see one 2021-07-01 incorrect date but that's immaterial.