Change Component Library and write component tests

[jb3rndt]

Closes #73

Changes made by this Pull Request

• Replace Inkline with Element Plus
• More and working component tests

Definition of Done

• [x] Tests are written and run successful
• [x] Code is documented
• [x] User Manual is updated
• [x] All requirements of the user story are met

ToDo

• [ ] Change font
• [x] actually write component tests

[codecov-commenter]

Codecov Report

Merging #107 (ba79227) into dev (3d8e017) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #107   +/-   ##
=======================================
  Coverage   95.51%   95.51%           
=======================================
  Files          18       18           
  Lines         357      357           
=======================================
  Hits          341      341           
  Misses         16       16           

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[jb3rndt]

We decided to abandon that (for now) because it causes some issues with the e2e tests and the new component tests do not add much value now and are redundant to the e2e tests.