refactor: simplify webpack

On top of !89 (merged)

requested review from @cedric

approved this merge request

added 10 commits

• a313aa36...a1a1b70c - 9 commits from branch epic/merge-faidare-dd
• a70b5fd0 - refactor: simplify webpack build and optimize css

Compare with previous version

enabled an automatic merge when the pipeline for a70b5fd0 succeeds

merged