docs: update keywords of charts

[hisImminence]

Which problem does the PR fix?

As discussed with @theburi, we are updating (extending) the keywords of the charts to increase the matches when searching in artifacthub.io. Keywords are aligned with marketing.

What's in this PR?

Checklist

Please make sure to follow our Contributing Guide.

Before opening the PR:

• In the repo's root dir, run make go.update-golden-only.
• There is no other open pull request for the same update/change.
• Tests for charts are added (if needed).
• In-repo documentation are updated (if needed).

After opening the PR:

• Did you sign our CLA (Contributor License Agreement)? It will show once you open the PR.
• Did all checks/tests pass in the PR?

[jessesimpson36]

I wonder if we should modify the index.yaml of the gh-pages branch for previously released versions.

[hisImminence]

I wonder if we should modify the index.yaml of the gh-pages branch for previously released versions.

Could you give more context about why we should do that? If we should - happy to do it end of next week!

[hisImminence]

And btw @aabouzaid - great that the maintenance workflow is working now - but 8.2-8.3 is failing 🙈

--> Mind have a look or writing a ticket?