[WIP] Add docs for removing images

[JeromeJu]

Changes

This commit adds the docs for removing images.

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• [ ] Has Docs included if any changes are user facing
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Release Notes

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[tekton-robot]

@JeromeJu: The label(s) kind/docs cannot be applied, because the repository doesn't have them.

In response to this:

/kind docs

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[JeromeJu]

/kind documentation

[JeromeJu]

cc @QuanZhang-William I have been aware that we are extracting some git-init related images for catalog. PTAL if there are anything to be added or this could be useful at all?

[lbernick]

I'm not sure we need docs specifically for removing images. For example, instructions on release notes are already covered by our process docs, and the integration test instructions are more relevant for pipelineresources than for removing images. We also don't really have a good way of knowing what catalog Tasks use these images. It might be more helpful to add a readme to the cmd/ folder explaining what each of the images are used for.

[dibyom]

• Remove the dependencies from publish.yaml

(This bit is important though - we should note that somewhere)

[QuanZhang-William]

cc @QuanZhang-William I have been aware that we are extracting some git-init related images for catalog. PTAL if there are anything to be added or this could be useful at all?

Thanks @JeromeJu for the heads up. There are 2 separate things:

1. Remove the images and all the dependencies from pipeline project
2. Host the image source code in separate repos (extract) if necessary

Seems like the instructions here are for 1). For 2) We can add an example when git-init image is extracted to verified catalog repo.

So /lgtm

[tekton-robot]

The following Tekton test failed:

Test name	Commit	Details	Required	Rerun command
check-pr-has-kind-label	bacc8d55190315fd99f5a06ede490b596b912926	link	true	/test check-pr-has-kind-label

[jerop]

Closing old PRs - it seems that were discussions about whether we need the docs at all, if you change your mind about needing the docs, feel free to reopen this PR