Update old spacetelescope urls

Author: mdboom

README.md

@@ -3,6 +3,6 @@ understanding-json-schema
 
 A website aiming to provide more accessible documentation for JSON schema.
 
-http://spacetelescope.github.io/understanding-json-schema/index.html
+http://json-schema.org/understanding-json-schema/index.html
 
-[![Build Status](https://travis-ci.org/spacetelescope/understanding-json-schema.png)](https://travis-ci.org/spacetelescope/understanding-json-schema)
+[![Build Status](https://travis-ci.org/json-schema-org/understanding-json-schema.png)](https://travis-ci.org/json-schema-org/understanding-json-schema)

source/_templates/layout.html

@@ -10,7 +10,7 @@
 
 {% block header %}
   {{ super() }}
-  <a href="https://github.com/spacetelescope/understanding-json-schema"
+  <a href="https://github.com/json-schema-org/understanding-json-schema"
      class="visible-desktop"><img
     style="position: absolute; z-index: 10; top: 40px; right: 0; border: 0;"
     src="https://s3.amazonaws.com/github/ribbons/forkme_right_white_ffffff.png"

source/index.rst

@@ -67,7 +67,7 @@ validator---just yet.
 .. only:: html
 
    There is also a `print version of this document
-   <http://spacetelescope.github.io/understanding-json-schema/UnderstandingJSONSchema.pdf>`__.
+   <http://json-schema.org/understanding-json-schema/UnderstandingJSONSchema.pdf>`__.
 
 .. toctree::
    :maxdepth: 1