Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -1,14 +1,7 @@
 Hi there,
 
-Please open a pull request with any suggestions you have regarding the
-example [CHANGELOG](CHANGELOG.md) or the [README](README.md).
+Please open a pull request with any suggestions you have.
 
+Edit files in [`source/`](source/). Each sub-directory is a different language translation of [`source/index.haml`](source/index.haml).
 
-Don't edit the [`index.html`](index.html) manually. Instead:
-
-1. make changes to [README](README.md) if necessary
-2. run [`generate.thor`](generate.thor) with `thor generate index`.
-3. add the `README.md` and `index.html` changes to a Pull Request.
-
-Tweaks, fixes and improvements to any of the [assets](assets/) are also
-quite welcome.
+You will need a maintainer to run `rake publish` for you once changes are merged in in order to update keepachangelog.com.