Remove info banner with registry migration from website and README.md of affected projects.

[twoGiants]

Feature request

Remove info banner around September 2025 or a bit later from the Tekton website and from the README.md files of affected projects related to the registry migration:

• remove banner from the tekton-website that is visible all the time, including the short info text and the link to the blog entry and information mail Remove the GHCR migration banner #687
• retain the blog entry on the tekton-website with the content of the information mail
• remove info note from the top of the README.md in:
  • pipeline: tektoncd/pipeline Remove the GHCR migration notice from the readme pipeline#9237
  • dashboard: tektoncd/dashboard Remove GHCR migration notice from the readme dashboard#4667
  • triggers: tektoncd/triggers Remove GHCR migration notice from readme triggers#1935
  • catalog: tektoncd/catalog Remove GHCR migration notice from readme catalog#1362
  • chains: tektoncd/chains Remove GHCR migration notice from the readme chains#1499
  • operator: tektoncd/operator Remove GHCR migration notice from the readme operator#3103
  • results: tektoncd/results Remove GHCR migration notice from the readme results#1171

This issue is being created for the removal of the banner several months after its addition on the website and the README.mds, while it can be kept in the blog entry. Parent issue #645.

Use case

The Tekton container images were successfully migrated from gcr.io to ghcr.io and an information mail was sent to the tekton-dev group. Many Tekton users might have seen the information through various channels by now. To keep the website and repositories clean and relevant, the temporary info banners should be removed, keeping only the blog entry for those interested in past changes.

This is a common maintenance practice to ensure content remains current and concise.

[twoGiants]

Thanks @AlanGreene ! Vincent was a bit quicker than me approving those PRs 😸 👍

[AlanGreene]

I just triggered a website deploy too so the project docs no longer show the banner for any projects configured to point to their main branch, e.g. Results and Chains.

Other projects pointing to a release branch still show the banner for releases where it was present, but it will be removed from their next release. It is already removed if viewing the docs for the main branch via the 'Other versions' option in the header.