Better align items in the "Join Us" page to the sections

[scholzj]

• The "Propose Enhancements" pane in the "Join Us" page is currently in the "Share" section and links to the proposals. That does not seem to make much sense, I think opening or reviewing a proposal is part of contributing and not sharing.
• Similarly, the "Showcase your adoption" is in the contributing section. But I would say that it is about sharing way more than about contributing. Adding an adopter helps to share the word about Strimzi and where it is used. It does not really contribute any docs, code or anything to the project.

So maybe we can switch those two between their sections to make some more sense out of it?

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• The Share section also talks in general abuot "helping others". But it does not link to the place where to help others. While Slack is linked in the Connect section, the GithUb part might not be obvious and we should have a link to the GitHub Discussions. Or possibly you can simply link to the "Get Help" page.

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• There is zero mention of the mailing lists on the "Join Us" page. They should be likely covered in the "Connect" section?
• The same should be for our YouTube channel -> again in the "Connect" section I guess?

[im-konge]

Triaged on 29.5.2025: We should have a look at this.