Meta: point out commit instructions

And make various other changes to modernize the README.

Author: annevk

README.md

@@ -1,17 +1,16 @@
-Web IDL
-=======
+# Web IDL
 
-This is the primary repository in which the Web IDL specification is developed.
-
-* [Latest Editor’s Draft](http://heycam.github.io/webidl/)
+This is the repository where the [Web IDL](http://heycam.github.io/webidl/) specification is developed.
 
 ## Contributing
 
 Good first bugs are marked as [short and easy](https://github.com/heycam/webidl/issues?utf8=%E2%9C%93&q=is%3Aopen+label%3A%22%E2%8C%9B+duration:short%22+label%3A%22%E2%98%95+difficulty:easy%22).
 
+IDL generally follows the [WHATWG Contributor Guidelines](https://github.com/whatwg/meta/blob/master/CONTRIBUTING.md) and [WHATWG Committer Guidelines](https://github.com/whatwg/meta/blob/master/COMMITTING.md), except as otherwise noted.
+
 ## Markup
 
-The specification is written in [Bikeshed](https://github.com/tabatkins/bikeshed), plus the [Ecmarkup tags](https://bterlson.github.io/ecmarkup/) `<emu-val>`, `<emu-t>`, and `<emu-nt>`. 
+The specification is written in [Bikeshed](https://github.com/tabatkins/bikeshed), plus the [Ecmarkup tags](https://bterlson.github.io/ecmarkup/) `<emu-val>`, `<emu-t>`, and `<emu-nt>`.
 
 ## Filing issues elsewhere
 
@@ -21,7 +20,6 @@ The specification is written in [Bikeshed](https://github.com/tabatkins/bikeshed
     *   [Gecko](https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&component=DOM&[email protected])
     *   [WebKit](https://bugs.webkit.org/enter_bug.cgi?product=WebKit&component=Bindings&short_desc=[WebIDL]%20)
     *   [Chromium](https://bugs.chromium.org/p/chromium/issues/entry?template=Defect%20report%20from%20developer&components=Blink%3EBindings&summary=[WebIDL]%20&comment&labels=Via-WebIDLRepo)
-    *   [Edge](https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/)
 *   [web-platform-tests](https://github.com/web-platform-tests/wpt/issues/new?title=%5BWebIDL%5D%20)
 *   [idlharness.js](https://github.com/web-platform-tests/wpt/issues/new?title=%5Bidlharness%5D%20) (used by testharness.js to run idl tests)
 
@@ -30,4 +28,3 @@ The specification is written in [Bikeshed](https://github.com/tabatkins/bikeshed
 *   [widlparser](https://github.com/plinss/widlparser/issues/new) (used by Bikeshed)
 *   [WebIDL parser](https://github.com/w3c/webidl2.js/issues/new) (used by idlharness.js)
 *   [TypeScript and JavaScript lib generator](https://github.com/Microsoft/TSJS-lib-generator/)
-