Backstage plugin docs

[aliok]

Backstage plugin docs.

Gonna remove the docs in the plugin repository and give a link to the knative.dev/docs

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[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aliok, matzew

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[matzew]

@aliok
can you verify the two issues above? (e.g. mkdocs)?

/hold

/cherry-pick release-1.15
(to make it directly visible on the standard homepage / current version)

[knative-prow-robot]

@matzew: new pull request created: #6128

In response to this:

@aliok
can you verify the two issues above? (e.g. mkdocs)?

/hold

/cherry-pick release-1.15
(to make it directly visible on the standard homepage / current version)

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