101 fix broken styling ngx

[RensNooren]

Description

Replaced Clarity with ngx bootstrap.
Fixed styling that got broken after replacing Clarity and fixed other styling problems.
Accordion styling that currently is implemented in the global scss will be fixed in a later issue.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• My code follows the style guidelines of this project
• I did not update API Controllers, if I did, I added/changed Postman tests
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I updated the changelog with an end-user readable description
• I assigned this pull request to the correct project board to update the sprint board

Link to issue

Closes: #101 #94

[MaxKorlaar]

app-layout.component.scss needs some rework for the btn-primary class.