Documentation: Fix all broken links

[Javagedes]

MkDocs v1.5.0 Updated how links were evaluated (See "Expanded Validaton of links" section). Before 1.5.0, most links in our documentation were left "untouched" as they either started or ended with a /.

... links that started with / ("absolute") and links that ended with / were left as is ...

However these links are now properly evaluated, which broke most links in edk2-pytool-extensions documentation. With this new evaluation, All of our links that started absolute (/) were now linking relative to tianocore.org instead of tianocore.org/edk2-pytool-extenisons.

This pull request updates the documentation to utilize the newly introduced absolute_links validation setting to be relative_to_docs which updates absolute paths to be relative to tianocore.org/edk2-pytool-extensions and updates any path references to point to the markdown file, which is necessary for the relative_to_docs setting to work as expected.

Resolves #855

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.70%. Comparing base (bf643b0) to head (a332ea8).
Report is 89 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #856      +/-   ##
==========================================
- Coverage   78.75%   78.70%   -0.05%     
==========================================
  Files          49       41       -8     
  Lines        4909     5049     +140     
==========================================
+ Hits         3866     3974     +108     
- Misses       1043     1075      +32     

see 49 files with indirect coverage changes

[makubacki]

It would be nice if you could try to track down a little more info and add it to the PR description or issue.

[Javagedes]

It would be nice if you could try to track down a little more info and add it to the PR description or issue.

Updated the pull request documentation as requested. Thanks!