feat(patterns): add rhoso-gitops pattern docs

[cjeanner]

Add sandbox-tier documentation for the RHOSO GitOps pattern: overview, getting started, cluster sizing, configuration, and troubleshooting pages, reusable AsciiDoc modules, metadata from pattern-metadata.yaml, shared RHOSO attributes, and spellcheck wordlist entries.

Pattern repository links use cjeanner/pattern-rhoso-gitops for now. TODO(repo-move) comments mark github, bugs, and deploy URLs to update once the repo moves to validatedpatterns-sandbox/rhoso-gitops.

Architecture diagrams (GitOps delivery and infrastructure topology) were created on Miro and exported as SVG under static/images/rhoso-gitops/.

AI-Assist: Cursor; model=Composer; mode=agent; origin=cursor

[openshift-ci]

Hi @cjeanner. Thanks for your PR.

I'm waiting for a validatedpatterns member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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