docs: Add surge.sh to main page of static site hosters

See #1994

docs/content/overview/introduction.md

@@ -21,7 +21,8 @@ writing experience.
 
 Sites built with Hugo are extremely fast and very secure. Hugo sites can
 be hosted anywhere, including [Heroku][], [GoDaddy][], [DreamHost][],
-[GitHub Pages][], [Aerobatic][], [Google Cloud Storage][], [Amazon S3][] and [CloudFront][], and work well with CDNs.
+[GitHub Pages][], [Surge][], [Aerobatic][], [Google Cloud Storage][],
+[Amazon S3][] and [CloudFront][], and work well with CDNs.
 Hugo sites run without dependencies on expensive runtimes like Ruby,
 Python or PHP and without dependencies on any databases.
 
@@ -33,6 +34,7 @@ Python or PHP and without dependencies on any databases.
 [Google Cloud Storage]: http://cloud.google.com/storage/
 [Amazon S3]: http://aws.amazon.com/s3/
 [CloudFront]: http://aws.amazon.com/cloudfront/ "Amazon CloudFront"
+[Surge]: https://surge.sh
 
 We think of Hugo as the ideal website creation tool. With nearly instant
 build times and the ability to rebuild whenever a change is made, Hugo