update readme and fix links

Author: letmaik

README.md

@@ -1,5 +1,5 @@
 # CoverageJSON Cookbook
 
-This cookbook introduces the [CoverageJSON](https://github.com/Reading-eScience-Centre/coveragejson/blob/master/spec.md) format in an interactive and easy way. It is targeted at anyone who wants to create or understand CoverageJSON documents. It makes use of the [CoverageJSON Playground](http://reading-escience-centre.github.io/covjson-playground/) which is a web tool that visualizes CoverageJSON documents and allows to edit them with immediate feedback.
+This cookbook introduces the [CoverageJSON](http://covjson.org) format in an interactive and easy way. It is targeted at anyone who wants to create or understand CoverageJSON documents. It makes use of the [CoverageJSON Playground](http://covjson.org/playground/) which is a web tool that visualizes CoverageJSON documents and allows to edit them with immediate feedback.
 
-The [source code of this book](https://github.com/Reading-eScience-Centre/coveragejson-cookbook) is hosted on GitHub. If you have any suggestions for improvement or want to contribute specific content, please create [an issue](https://github.com/Reading-eScience-Centre/coveragejson-cookbook/issues) or submit [a pull request](https://github.com/Reading-eScience-Centre/coveragejson-cookbook/pulls).
+The [source code of this book](https://github.com/covjson/cookbook) is hosted on GitHub. If you have any suggestions for improvement or want to contribute specific content, please create [an issue](https://github.com/covjson/cookbook/issues) or submit [a pull request](https://github.com/covjson/cookbook/pulls).

macros.md

@@ -1,5 +1,5 @@
 {% macro playgroundLink(filename, title='Open in Playground') -%}
-  [{{ title }}](http://reading-escience-centre.github.io/covjson-playground/#https://raw.githubusercontent.com/reading-escience-centre/coveragejson-cookbook/master/examples/{{ filename }})
+  <a href="http://covjson.org/playground/#https://raw.githubusercontent.com/covjson/cookbook/master/examples/{{ filename }}" target="_blank">{{ title }}</a>
 {%- endmacro %}
 
 {% macro exampleCode(filename) -%}