infra: cleanup clean command

[ST-DDT]

• The /locale folder has been removed a long time ago
• The docs/.vitepress/cache folder is in the gitignore, not sure what it is used for exactly

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.96%. Comparing base (e21fcaf) to head (4eb4525).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #2979   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files        2748     2748           
  Lines      239091   239091           
  Branches      944      943    -1     
=======================================
  Hits       238999   238999           
+ Misses         92       91    -1     
- Partials        0        1    +1     

see 3 files with indirect coverage changes

[xDivisionByZerox]

• The docs/.vitepress/cache folder is in the gitignore, not sure what it is used for exactly

FFR: site-config#cachedir