Since the check is async, starting the server on the port was happening before the check finished. Thus even if the port wasn't being used, it would error out as if it was because the server would start it before the check was finished.
This way we only start the server after the check finishes.
Test:
Ran a separate server on port 3000
```
Checking if port 3000 is free...
Extracting translateable strings from files...
Loading translation files...
Generating Metadata for Docs....
Generating Metadata for Docs....
server.js triggered...
Generating Metadata for Docs....
Extracting translateable strings from files...
listening on port: 3000
Open http://localhost:3000/
Port 3000 is in use
```
Fixes#124
