message: docs(serverless-component): update readme with custom domain name instructions
diff: @@ -97,7 +97,12 @@ $ serverless
  In most cases you wouldn't want to use CloudFront's distribution domain to access your application. Instead, you can specify a custom domain name.
  -Make sure you've purchased your `domain` within Route53:
  +You can use any domain name but you must be using AWS Route53 for your DNS hosting. To migrate DNS records from an existing domain follow the instructions
  +[here](https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/MigratingDNS.html). The requirements to use a custom domain name:
  + * Route53 must include a _hosted zone_ for your domain (e.g. `mydomain.com`) with a set of nameservers.
  + * You must update the nameservers listed with your domain name registrar (e.g. namecheap, godaddy, etc.) with those provided for your new _hosted zone_.
  +
  +The serverless next.js component will automatically generate an SSL certificate and create a new record to point to your CloudFront distribution.
  ```yml
  # serverless.yml
  