Bring readme up to date

Author: svgeesus

README.markdown

@@ -5,15 +5,14 @@ This is the official CSSWG repository for editor's drafts of CSS specifications.
 See the [contributor guidelines](CONTRIBUTING.md) for how to contribute.
 
 Specification issues are discussed as issues in this repository.
-General CSSWG discussion can be found on the public
+
+Minutes of CSSWG discussion can be found on the public
 [www-style mailing list](https://lists.w3.org/Archives/Public/www-style/).
 
 To read the specifications in this repository, see them at the
 [index of all specifications](https://drafts.csswg.org/).
 
-This repository is a two-way mirror of https://hg.csswg.org/drafts, and
-contributing using Mercurial is also possible.
 
 Also see the related repositories:
-* [fxtf-drafts github repository](https://github.com/w3c/fxtf-drafts/) - [fxtf mercurial repository](https://hg.fxtf.org/drafts/) - [FX Task Force generated specification index](https://drafts.fxtf.org/)
-* [css-houdini-drafts github repository](https://github.com/w3c/css-houdini-drafts/) - [css-houdini mercurial repository](https://hg.css-houdini.org/drafts/) - [CSS-TAG Houdini Task Force generated specification index](https://drafts.css-houdini.org/)
+* [fxtf-drafts github repository](https://github.com/w3c/fxtf-drafts/) - [FX Task Force generated specification index](https://drafts.fxtf.org/)
+* [css-houdini-drafts github repository](https://github.com/w3c/css-houdini-drafts/) - [CSS-TAG Houdini Task Force generated specification index](https://drafts.css-houdini.org/)