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

#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