Release v0.2

Following features were added:

• support for multiple configs which are linked to the input config using @link operator
• tailcall check is run before deploying the config
• port for the fly app can be configured by setting port in the config
• fly-app-name defaults to <orgname>-<reponame> if not specified
• health check is performed after deployment to make sure the deployed server works correctly

Bug fixes:

• redeployment works without failure
• hostname for fly does not have to be set to "0.0.0.0" manually for the deployment to work correctly
• when deploying to fly, config does not necessarily have to be present in the root