#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

created Homepage Layout with picture and texts, created Navbar and Routes, creates Searchbar and Filterpage, created 'Plantdetails-Page' #10 #11 #12 #13 #14 #15 #16