#43 use growbros fetcher for Wunschliste and Garten, improve FetchResult type, PlantDetails uses path param now

#43 include JWT in fetcher, reformatting and refactoring, add props and custom fetch methods to some components

#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