Make API location configurable

src/pages/Results.tsx

@@ -158,7 +158,7 @@ const Results = (): JSX.Element => {
 
   const urlTypeOnly = ['url'] as AddressType[]; // Many jobs only run with these address types
 
-  const api = '/api';
+  const api = process.env.REACT_APP_API_ENDPOINT || '/api'; // Where is the API hosted?
 
   // Fetch and parse IP address for given URL
   const [ipAddress, setIpAddress] = useMotherHook({