Added NIP-50 search to relays and relay sets on Nostrrr.

https://i.nostr.build/8WZX.jpg#m=image%2Fjpeg&dim=1080x2400&blurhash=%5B1QS%7D30K4TWX00oykXt700m%2CtRt700xas.fj00.SIAD%2500%24*o%7DIU00R5.8RP%7EUb__2%25M00x%5E%5Ejx%5D&x=f0c64d5e599c6bbc3749086b5cab62783675c72d0e89b4e6f1cee66a8695c3da