Update the "releases" section of the Blog

[RichieEscarez]

Blog -> Releases

Determine how to use this section going forward. It is outdated and excludes mention of any of the recent releases.

Will contributors continue to add posts here for each release?

[knative-housekeeping-robot]

Issues go stale after 90 days of inactivity.
Mark the issue as fresh by adding the comment /remove-lifecycle stale.
Stale issues rot after an additional 30 days of inactivity and eventually close.
If this issue is safe to close now please do so by adding the comment /close.

Send feedback to Knative Productivity Slack channel or file an issue in knative/test-infra.

/lifecycle stale