Website: Add release schedule on the releases page

[jbonofre]

No description provided.

[jbonofre]

This supersedes apache/iceberg-docs#298

@bitsondatadev ^^

[bitsondatadev]

Thanks @jbonofre

[jbonofre]

@bitsondatadev @Fokko thoughts about this PR ? Thanks !

[jbonofre]

@Fokko @bitsondatadev @ajantha-bhat I updated this PR including Fokko's comment and rebasing.

[Fokko]

I was looking for this when working on #10806. I think it is good to add this 👍

[bitsondatadev]

This looks good to me! Me thinks we ship it!

[github-actions]

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[github-actions]

This pull request has been closed due to lack of activity. This is not a judgement on the merit of the PR in any way. It is just a way of keeping the PR queue manageable. If you think that is incorrect, or the pull request requires review, you can revive the PR at any time.