Docs front-page refresh

[Miles-Garnsey]

What this PR does:

Rolling PR to address issues I've seen in the docs while putting together a design doc. For some reason, our front page still had as much info on k8ssandra 1.x (Helm) as it did on k8ssandra-operator. Given that 1x has been deprecated for so long, this really needed to be fixed.

The front page also didn't do anything to tell a prospective user what k8ssandra-operator was supposed to do, beyond the - somewhat gnomic - This is the Kubernetes operator for K8ssandra. What even is that?

Which issue(s) this PR fixes:

Fixes #1075

Checklist

• Changes manually tested
• Automated Tests added/updated
• Documentation added/updated
• CHANGELOG.md updated (not required for documentation PRs)
• CLA Signed: DataStax CLA

[codecov]

Codecov Report

Merging #1071 (934e5f0) into main (31fb6cd) will decrease coverage by 0.05%.
Report is 3 commits behind head on main.
The diff coverage is n/a.

❗ Current head 934e5f0 differs from pull request most recent head e1c73f5. Consider uploading reports for the commit e1c73f5 to get more accurate results

@@            Coverage Diff             @@
##             main    #1071      +/-   ##
==========================================
- Coverage   57.31%   57.26%   -0.05%     
==========================================
  Files         100      100              
  Lines       10160    10160              
==========================================
- Hits         5823     5818       -5     
- Misses       3828     3831       +3     
- Partials      509      511       +2     

see 4 files with indirect coverage changes

[bradfordcp]

One minor suggestion, but it’s not a blocker.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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