Migrate to Bulma v1

[janosrusiczki]

• All imports seem to be ok
• Logo variation for dark mode (+ support files)
• Wait until .is-variable is fixed - Columns is-variable not working jgthms/bulma#3799

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.00%. Comparing base (3410894) to head (3967f64).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #720   +/-   ##
=======================================
  Coverage   81.00%   81.00%           
=======================================
  Files         114      114           
  Lines        1737     1737           
=======================================
  Hits         1407     1407           
  Misses        330      330           

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