Various small UX improvements

[nkubala]

• Consistent capitalization in docs
• Move skaffold fix out of "Pipeline Building Blocks"
• Hide the skaffold schema and skaffold credits commands
• Fix the available log levels
• Remove feature maturities from command help text

[codecov]

Codecov Report

Merging #6426 (cce61ac) into main (5ceca63) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #6426      +/-   ##
==========================================
- Coverage   70.48%   70.40%   -0.09%     
==========================================
  Files         498      505       +7     
  Lines       22593    22842     +249     
==========================================
+ Hits        15925    16082     +157     
- Misses       5638     5708      +70     
- Partials     1030     1052      +22     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/cmd.go	71.05% <100.00%> (-0.46%)	⬇️
cmd/skaffold/app/cmd/config.go	100.00% <100.00%> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <100.00%> (ø)
cmd/skaffold/app/cmd/debug.go	100.00% <100.00%> (ø)
cmd/skaffold/app/cmd/delete.go	55.55% <100.00%> (ø)
cmd/skaffold/app/cmd/filter.go	25.00% <100.00%> (ø)
cmd/skaffold/app/cmd/init.go	100.00% <100.00%> (ø)
cmd/skaffold/app/cmd/render.go	41.37% <100.00%> (ø)
cmd/skaffold/app/cmd/schema.go	83.33% <100.00%> (+0.72%)	⬆️
pkg/skaffold/event/v2/status_check.go	85.45% <0.00%> (-14.55%)	⬇️
... and 47 more

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[tejal29]

• Hide the skaffold schema and skaffold credits commands

I think skaffold credits command is a legal requirement. It is to make sure anyone using skaffold knows which licenses etc users are pulling in. I feel we should keep it on the docs page for visibility.

[aaron-prindle]

LGTM