feat(interview): Rewrite interview using React and Redux [0]

[jochenklar]

This PR will add a new React/Redux based interview, which replaces project_questions. It will also remove the vendor file system and django-compressor/SASS. So far the following changes are implemented:

• Add project_interview view
• Refactor webpack config

This PR is the first part of the big React/Redux based refactoring of the interview. It contains the following changes:

• Add new interview interface based on React and Redux (Modernize the RDMO frontend #518)
  • Text and Textarea widgets are now saved automatically
  • Select dropdown widgets are now always searchable
  • Remove custom widgets feature
  • Fix several issues regarding the interface (show the unit of a question next to the answer field #499, Range slider does not save value automatically on touch devices #501)
  • Display attributes in interview to admins, editors, reviewers (Display attributes in interview, answers, etc. to admins, editors, reviewers #224)
  • Improve accessibility (RDMO should follow common accessibility guidelines #514, Accessibility review #1199)

CHANGELOG.md will be updated at the end to not complicate things further.

[coveralls]

coverage: 91.563% (-0.03%) from 91.591%
when pulling 4878a6a on interview
into c945d7d on main.

[MyPyDavid]

maybe rename to Breadcrumb.js ;)

[jochenklar]

Yes, I will do so at the end.

[MyPyDavid]

thanks for all the work!