MNEMONIC-355: Remove Github link from navigator menu
diff --git a/src/_includes/primary-nav-items.html b/src/_includes/primary-nav-items.html
index 1a57ff8..32c42da 100644
--- a/src/_includes/primary-nav-items.html
+++ b/src/_includes/primary-nav-items.html
@@ -18,9 +18,6 @@
   <li class="{% if page.url contains '/develop/' %}current{% endif %}">
     <a href="/develop/">Develop</a>
   </li>
-  <li>
-    <a href="https://github.com/apache/incubator-mnemonic" target="_blank">GitHub</a>
-  </li>
   <li class="{% if page.url contains '/help/' %}current{% endif %}">
     <a href="/help/">Help</a>
   </li>
diff --git a/src/develop/index.md b/src/develop/index.md
index 8bcb333..ad064b2 100644
--- a/src/develop/index.md
+++ b/src/develop/index.md
@@ -161,7 +161,7 @@
 
 You can subscribe to the lists by sending email to<br/>
 *list*-subscribe@mnemonic.incubator.apache.org<br/>
-and unsubscribe by sending email to<br/>
+and un-subscribe by sending email to<br/>
 *list*-unsubscribe@mnemonic.incubator.apache.org.<br/>
 
 ## Source code
@@ -170,19 +170,17 @@
 
 `% git clone https://git-wip-us.apache.org/repos/asf/incubator-mnemonic.git`
 
--- or --
-
-`% git clone https://github.com/apache/incubator-mnemonic.git`
-
 The important branches are:
 
-* [master](https://github.com/apache/incubator-mnemonic/tree/master) -
-  The trunk for all developement
-* [asf-site](https://git-wip-us.apache.org/repos/asf?p=incubator-mnemonic-site.git) -
+* [master](https://git-wip-us.apache.org/repos/asf/incubator-mnemonic.git){:target="_blank"} -
+  The trunk for all development, please find master branch marked in light green.
+* [asf-site](https://git-wip-us.apache.org/repos/asf/incubator-mnemonic-site.git){:target="_blank"} -
   The pages that are deployed to https://mnemonic.apache.org/
 
 Please check our [coding guidelines](coding).
 
+You can also find the mirrored repo. on [Github](https://github.com/apache/incubator-mnemonic.git){:target="_blank"}
+
 ## Reviews
 
 All code must be +1'ed by a committer other than the author prior to its