Greg 39 form validation

See merge request !55

Issue: GREG-39

Greg 46 routing

See merge request !56

Issue: GREG-46

- Add routing with react routing
- Placeholder header/footer and some pages

Issue: GREG-46

No longer any need for each theme to be fully defined.
Start on react-router

Issue: GREG-40
Issue: GREG-46

Add a simple loading component and spinner animation

See merge request !52

Feature/orgreg ous

See merge request !49

GREG-41: Adding custom link

See merge request !50

Add basic theming support.

See merge request !51

Issue: GREG-40

- Add global styling. Remove the old css file.
- Start on the themes

Issue: GREG-40

Enables rollback to previous version of a Consent Type in the history
part of the admin interface.

- Takes OrgReg url and api key as arguments
- Assumes that the OrgReg api has been registered behind a Gravitee
  instance.
- Introduces active and deleted fields to OrganizationalUnit for
  keeping track of status in OrgReg. Logic should be introduced in the
  future to ensure that Sponsors and Guests are not connected to
  deleted or inactive OUs.
- Add search and orgreg_id to Admin interface of OUs.

Enable absolute imports

See merge request !48

Configure prettier to prefer no semicolons. Format all files.

See merge request !47

i18next support

See merge request !46

Issue: GREG-37

Feature/hasconsented

See merge request !43

Adds a setupProxy config:
The package i18next-http-backend and the proxy config does not work
together. The proxy setup hijacks the loading of the translation files.
Adds a setupProxy.js to only proxy /api.

Adds a simple prettier config

Issue: GREG-37

Switch from next.js to create-react-app

See merge request !45