Update about page

Author: afh

source/about.html.md

@@ -16,7 +16,7 @@ branch.
 There is also a wiki, that of the ledger repo on GitHub, with a convenient
 url alias: [wiki.ledger-cli.org](http://wiki.ledger-cli.org).
 
-The site is built using [Travis CI](https://travis-ci.org/ledger/ledger-website) and deploys to an Amazon S3 bucket
+The site is built using [GitHub Actions](https://github.com/ledger/ledger-website/actions) and deploys to an Amazon S3 bucket
 which is then served up with an Amazon CloudFront distribution.
 
 We use this small [Lambda@Edge](http://docs.aws.amazon.com/lambda/latest/dg/lambda-edge.html) function to serve redirects and to redirect bare domain to `www`: