fix: add languages command to cmd root

[lance]

This command does not get surfaced to the user without adding it to the root.
Also add a little more information to the short description.

Signed-off-by: Lance Ball lball@redhat.com

[knative-prow]

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This pull-request has been approved by: lance

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[codecov]

Codecov Report

Merging #1127 (55df1b9) into main (b1fd9f7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1127   +/-   ##
=======================================
  Coverage   45.89%   45.89%           
=======================================
  Files          65       65           
  Lines        8701     8702    +1     
=======================================
+ Hits         3993     3994    +1     
  Misses       4321     4321           
  Partials      387      387           

Impacted Files	Coverage Δ
cmd/languages.go	90.32% <100.00%> (ø)
cmd/root.go	75.19% <100.00%> (+0.09%)	⬆️

[matejvasek]

/lgtm