Add Red Hat RHEL startup offer

[joaorgb15]

What changed

Adds Red Hat and its startup-specific RHEL offer for eligible participants in the Google for Startups Cloud Program, including $2,000 in RHEL software credits for up to 6 months and 6 months of technical support.

Closes #1221

Sources

• https://www.redhat.com/en/engage/partner-with-red-hat-20260714
• https://www.redhat.com/en/blog/red-hat-extends-rhel-special-offering-participants-google-startups-cloud-program

Certification

• I changed only allowed repository content and did not mix Entity YAML with other paths.
• Public sources substantiate every submitted factual value; any Sourcey-written prose is a neutral summary, not a fabricated vendor quote.
• I did not author verification, provenance, freshness, or signature claims.
• My commits include a Signed-off-by line.