moved node version section in README to advanced usage

added link to README
* migrated contents of version-file-workflow.yml to versions.yml
* further refactored parseNodeVersionFile() & tests
* removed type annotations in catch ()

src/main.ts

@@ -80,11 +80,9 @@ export async function run() {
   }
 }
 
-
 function isGhes(): boolean {
   const ghUrl = new URL(
     process.env['GITHUB_SERVER_URL'] || 'https://github.com'
   );
   return ghUrl.hostname.toUpperCase() !== 'GITHUB.COM';
-}
-
+}