Make the message for when the server is running shorter (#2262)

src/commands/dev/lib/dev-server.ts

@@ -459,7 +459,7 @@ export default class DevServer {
     }
 
     this.output.ready(
-      `Development server running at ${chalk.cyan.underline(
+      `Available at ${chalk.cyan.underline(
         address.replace('[::]', 'localhost')
       )}`
     );

test/dev-server.unit.js

@@ -15,7 +15,7 @@ test.before(async () => {
   const output = createOutput({})
   const origReady = output.ready
   output.ready = msg => {
-    if (msg.toString().match(/Development server running at/)) {
+    if (msg.toString().match(/Available at/)) {
       readyResolve()
     }
     origReady(msg)