Closes #40 : Custom useGrowbrosFetcher hook to make calls to the backend.

Closes #40

See merge request !28

#40 custom fetcher hook. clean up base url in backend connector. set up environment variable for backend URL. env interface.

#40 Search plants endpoint: now accepts query params. introduce CustomPage schema on frontend. tests for plants controller done

Resolve "plants controller: GET für einzelne Pflanze"

Closes #41

See merge request !26

add Swagger / OpenAPI #30

See merge request !24