docs: Highlight Kubernetes Docs More Clearly

[guettli]

Closes #941

This PR moves the unsupported lines (Docker Swarm, Nomand) to the buttom, so that the supported docs are more visible.

Result looks like this now: https://github.com/guettli/csi-driver/tree/tg/highlight-kubernetes-docs-more-clearly?tab=readme-ov-file#getting-started

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.05%. Comparing base (c2667b0) to head (8aa9495).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #943   +/-   ##
=======================================
  Coverage   31.05%   31.05%           
=======================================
  Files          21       21           
  Lines        2077     2077           
=======================================
  Hits          645      645           
  Misses       1409     1409           
  Partials       23       23           

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[lukasmetzner]

Thank you for the contribution, I adjusted the docs a bit ^^