Updated links to reflect move to github. (#20)

* Updated links in navbar.yml to reflect move to github.

* Updated default.html to reflect move to github.

* Updated index.md to reflect move to github.

* Created separate page for the legacy development links: bug tracker, mercurial, github mirror.

* Added missing file for previous commit.

Author: Stewori

_data/navbar.yml

@@ -24,11 +24,11 @@ navbar:
   - title: Development
     subItems:
       - title: Bug tracker
-        url: https://bugs.jython.org/
+        url: https://github.com/jython/jython/issues/
       - title: Github
-        url: https://github.com/jythontools/jython
-      - title: Mercurial
-        url: https://hg.python.org/jython/
+        url: https://github.com/jython/jython/
+      - title: Legacy
+        url: legacy-dev
       - title: Mailing List
         url: https://sourceforge.net/p/jython/mailman/
       - title: Developer Guide

_layouts/default.html

@@ -16,7 +16,7 @@
     <!-- HEADER -->
     <div id="header_wrap" class="outer">
         <header class="inner">
-          <a id="forkme_banner" href="https://github.com/jythontools/jython">View on Github</a>
+          <a id="forkme_banner" href="https://github.com/jython/jython">View on Github</a>
 
           <a id=logo href="index"><img id="logo"  src="assets/jython.png" alt="Jython Logo" height="70" width="109"></a>
 

index.md

@@ -2,7 +2,7 @@
 title: Home
 ---
 ## What is Jython?
-Jython is a [Java](https://go.java/index.html) implementation of [Python](https://www.python.org/) that combines expressive power with clarity. Jython is freely available for both commercial and non-commercial use and is distributed with source code under the [PSF License v2](https://github.com/jythontools/jython/blob/master/LICENSE.txt). Jython is complementary to Java and is especially suited for the following tasks:
+Jython is a [Java](https://go.java/index.html) implementation of [Python](https://www.python.org/) that combines expressive power with clarity. Jython is freely available for both commercial and non-commercial use and is distributed with source code under the [PSF License v2](https://github.com/jython/jython/blob/master/LICENSE.txt). Jython is complementary to Java and is especially suited for the following tasks:
 
  * Embedded scripting - Java programmers can add the Jython libraries to their system to allow end users to write simple or complicated scripts that add functionality to the application.
  * Interactive experimentation - Jython provides an interactive interpreter that can be used to interact with Java packages or with running Java applications. This allows programmers to experiment and debug any Java system using Jython.

legacy-dev.md

@@ -0,0 +1,11 @@
+---
+title: Legacy
+---
+## Development before move to Github
+
+### [Bug tracker](https://bugs.jython.org/)
+
+### [Mercurial](https://hg.python.org/jython/)
+
+### [Github mirror](https://github.com/jython/frozen-mirror/)
+This mirror is now frozen.