Fontawesome V6

[12rambau]

• use fontawesome V6
• change all the fas and far occurences by fa-solid(res. fa-regular)
• change the icons that were not free to their free alternative

note
fas will continue to work in v6 for quite some time so application will not need to change everything but their sizing is a bit different.

Fix #576

[codecov]

Codecov Report

Merging #645 (83ad765) into main (8a8196e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #645   +/-   ##
=======================================
  Coverage   92.63%   92.63%           
=======================================
  Files          36       36           
  Lines        3911     3912    +1     
=======================================
+ Hits         3623     3624    +1     
  Misses        288      288           

Impacted Files	Coverage Δ
sepal_ui/reclassify/reclassify_view.py	84.46% <ø> (ø)
sepal_ui/reclassify/table_view.py	59.45% <ø> (ø)
sepal_ui/sepalwidgets/inputs.py	100.00% <ø> (ø)
sepal_ui/frontend/styles.py	100.00% <100.00%> (ø)
sepal_ui/mapping/aoi_control.py	100.00% <100.00%> (ø)
sepal_ui/mapping/fullscreen_control.py	100.00% <100.00%> (ø)
sepal_ui/mapping/map_btn.py	100.00% <100.00%> (ø)
sepal_ui/mapping/value_inspector.py	88.99% <100.00%> (ø)
sepal_ui/sepalwidgets/app.py	95.86% <100.00%> (ø)
sepal_ui/sepalwidgets/btn.py	97.05% <100.00%> (ø)
... and 1 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[12rambau]

I need this PR to be merged for the conda release. I'm overpassing review checks. Don't hesitate to reach in the issues if needed