Broken links in README_validation.md and README.md

[iMichaela]

Describe the bug

The following broken links in the README_validation.md need to be updated. Content of the file might need update to indicate schemas are part of the assets of a release, and point to the latest release.

https://github.com/usnistgov/OSCAL/tree/main/xml/schema
https://github.com/usnistgov/OSCAL/tree/main/json/schema
https://github.com/usnistgov/OSCAL/blob/main/docs/content/downloads/_index.md#oscal-releases

The following broken link in the README.md need to be updated:

https://github.com/usnistgov/OSCAL/actions/workflows/status-ci-cd.yml/badge.svg

Who is the bug affecting

All OSCAL users

What is affected by this bug

Documentation, Website

How do we replicate this issue

Click on the links provided above

Expected behavior (i.e. solution)

README_validation.md: Content of the file might need update to indicate schemas are part of the assets of a release, and point to the latest release.

Other comments

No response

Revisions

No response

[aj-stein-nist]

This was handled as part of usnistgov/OSCAL-Pages#28 and it's related issue, closing as duplicate.