docs: Add Firebase Hosting to usage.md

docs/content/overview/usage.md

@@ -134,9 +134,9 @@ You may then **deploy your site** by copying the `public/` directory
 to your production web server.
 
 Since Hugo generates a static website, your site can be hosted anywhere,
-including [Heroku][], [GoDaddy][], [DreamHost][], [GitHub Pages][], [GitLab][],
-[Amazon S3][] with [CloudFront][], or any other cheap (or even free) static web
-hosting service.
+including [Heroku][], [GoDaddy][], [DreamHost][], [GitHub Pages][],
+[Amazon S3][] with [CloudFront][], [Firebase Hosting][],
+or any other cheap (or even free) static web hosting service.
 
 [Apache][], [nginx][], [IIS][]...  Any web server software would do!
 
@@ -150,7 +150,7 @@ hosting service.
 [GitLab]: https://about.gitlab.com
 [Amazon S3]: http://aws.amazon.com/s3/
 [CloudFront]: http://aws.amazon.com/cloudfront/ "Amazon CloudFront"
-
+[Firebase Hosting]: https://firebase.google.com/docs/hosting/
 
 ### A note about deployment