docs: list projects built on soulseek-rs-lib

Add a 'Projects using soulseek-rs-lib' section to the README and a
matching section on the website community page, starting with seakarr.
Both point new projects at issue #12 to reserve a client minor version.

website/src/lib/links.ts

@@ -13,6 +13,8 @@ export const LINKS = {
   slskd: 'https://github.com/slskd/slskd',
   slsknet: 'https://www.slsknet.org',
   seeleseek: 'https://seeleseek.net',
+  seakarr: 'https://github.com/binhex/seakarr',
+  minorVersions: 'https://github.com/michel/soulseek-rs/issues/12',
 } as const
 
 export const VERSION = __APP_VERSION__