Added AsciiDoc k3kcli automation

[enrichman]

This PR adds an automation to create an AsciiDoc k3kcli.adoc file with the cli documentation.

This file has the same structure/format of the k3kcli.adoc file used in the rancher/k3k-product-docs repo.

To achieve this the docs Makefile target was split in two, adding a docs-crds and a docs-cli target. The docs-cli uses a script with pandoc to merge and create the k3kcli.adoc file, with a custom Lua script to handle some tweaks from the Cobra generated Markdown (i.e. removing the SEE ALSO links to the different pages, since we are using a single file).

This PR also updates some of the commands Short descriptions to match the updates made from the Doc team.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.65%. Comparing base (fc6bced) to head (7a1bdb0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #597      +/-   ##
==========================================
- Coverage   60.80%   60.65%   -0.16%     
==========================================
  Files          55       55              
  Lines        5294     5294              
==========================================
- Hits         3219     3211       -8     
- Misses       1775     1779       +4     
- Partials      300      304       +4     

Flag	Coverage Δ
cli	54.13% <100.00%> (ø)
controller	56.80% <0.00%> (-0.03%)	⬇️
e2e	56.80% <0.00%> (-0.03%)	⬇️
unit	37.63% <0.00%> (-0.04%)	⬇️

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