feat(styling)!: delete "bare" Themes but keep "lite" & add to Bootstrap

[ghiscoding]

Here's quick details about file size comparison with/without "lite" for each theme. I think Material is slightly larger because it also includes the the Roboto font family

Also tested in Angular-Slickgrid, all is good after migrating all .fa to .mdi icons. I also tested the "lite" edition and it works correctly too (sort, grouping, ... icons are showing but not the menu ones)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.7%. Comparing base (75dce74) to head (43f9bce).

Additional details and impacted files

@@          Coverage Diff          @@
##            next   #1493   +/-   ##
=====================================
  Coverage   99.7%   99.7%           
=====================================
  Files        197     197           
  Lines      21652   21652           
  Branches    7207    7207           
=====================================
  Hits       21586   21586           
+ Misses        66      60    -6     
- Partials       0       6    +6     

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[ghiscoding]

After testing the change in Angular-Slickgrid, I pushed a couple of small commits and I don't see any problems with this new implementation, so I'm gonna go ahead and merge.