doc: Cleanup Google Code links and obsolete design description

Replace the links in NOTICE to the closed down Google Code
(code.google.com) with their Github counterparts where the projects
moved to.

Gitblit used to download dependencies upon first start. This has since
long been changed and everything is bundled with Gitblit now. So reflect
this in the design.mkd document, which still said they would be
downloaded.

NOTICE

@@ -21,7 +21,7 @@ google-code-prettify
    google-code-prettify, released under the
    Apache Software License, Version 2.0.
 
-   http://code.google.com/p/google-code-prettify
+   https://github.com/googlearchive/code-prettify
 
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 Commons Daemon
@@ -125,7 +125,7 @@ google-gson
    google-gson, released under the
    Apache-style Software License.
 
-   http://code.google.com/p/google-gson
+   https://github.com/google/gson
 
 ---------------------------------------------------------------------------
 javamail
@@ -365,8 +365,8 @@ google-guice
    google-guice, release under the 
    Apache License 2.0
 
-   https://code.google.com/p/google-guice
-   
+   https://github.com/google/guice
+
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 clipboard.js
 ---------------------------------------------------------------------------

src/site/design.mkd

@@ -24,10 +24,6 @@ The following dependencies are bundled with Gitblit.
 - modified Git logo originally designed by [Henrik Nyh](http://henrik.nyh.se/2007/06/alternative-git-logo-and-favicon)
 - fork icon courtesy of [Ember.js](http://emberjs.com)
 - other icons courtesy of [FatCow Hosting](http://www.fatcow.com/free-icons) (Creative Commons CC-BY)
-
-### Downloaded Dependencies
-The following dependencies are automatically downloaded by Gitblit GO (or already bundled with the WAR) from the Apache Maven repository and from the Eclipse Maven repository when Gitblit is launched for the first time.
-
 - [JGit][jgit] (EDL 1.0)
 - [Wicket](http://wicket.apache.org) (Apache 2.0)
 - [Jetty](http://eclipse.org/jetty) (Apache 2.0, EPL 1.0)