Fix links in documentation

[pamelafox]

Purpose

Fixes #1422

This PR fixes links in docs, preferring absolute URLs over relative URLs which are more likely to break if docs get moved around. The absolute URLs seem to work, from my tests.

Also updated a few docs sections while I was in them. :)

Does this introduce a breaking change?

When developers merge from main and run the server, azd up, or azd deploy, will this produce an error?
If you're not sure, try it out on an old environment.

[ ] Yes
[X] No

Does this require changes to learn.microsoft.com docs?

This repository is referenced by this tutorial
which includes deployment, settings and usage instructions. If text or screenshot need to change in the tutorial,
check the box below and notify the tutorial author. A Microsoft employee can do this for you if you're an external contributor.

[ ] Yes
[X] No

Type of change

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[X] Documentation content changes
[ ] Other... Please describe:

Code quality checklist

See CONTRIBUTING.md for more details.

N/A

[github-actions]

Check Broken Paths

We have automatically detected the following broken relative paths in your lessons. Review and fix the paths to resolve this issue.

Check the file paths and associated broken paths inside them. For more details, check our Contributing Guide.

File Full Path	Issues
./docs/login_and_acl.md	1. ./app/backend/core/authentication.py

[github-actions]

Check Broken Paths

We have automatically detected the following broken relative paths in your lessons. Review and fix the paths to resolve this issue.

Check the file paths and associated broken paths inside them. For more details, check our Contributing Guide.

File Full Path	Issues
./docs/login_and_acl.md	1. ./app/backend/core/authentication.py

[pamelafox]

New load balancer links

[pamelafox]

New section to encourage evaluation (this section is also in customizing doc)

[pamelafox]

cc @john0isaac

[john0isaac]

The workflow is not passing it's skipping the URLs now.
To catch the URL by the workflow it needs to start with ./ or ../

Also, the relative reference is needed to be able to evaluate it relatively.

[john0isaac]

for example to fix the comments posted by the workflow you needed to add an extra . in front of the /app
change ./app/backend/core/authentication.py to ../
removing the . dots makes it skip it.

[pamelafox]

Changed to relative paths, and checker is still passing.