docs: V3 docs rebase

[Jcahilltorre]

Proposed changes

This PR combines the current v3 docs work from the v3-documentation branch and updates the v2 docs in the v2 folder with the current v2 docs from the main branch.

Also fixes the relative links broken by moving the v2 docs

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13