Adds a Github link on the API page's sidebar

Fixes gruntjs#137

Author: leobalter

src/tmpl/docs.jade

@@ -17,15 +17,18 @@ block content
               ul.nav.nav-list
                 each link in sidebar
                   if link.url
-                    if locals.rootSidebar
-                      li
-                        a(href='/' + link.url, class=locals.pageSegment == link.url && 'active')= link.name
+                    - var linkHref
+                    if link.external
+                      - linkHref = link.url
+                    else if locals.rootSidebar
+                      - linkHref = '/' + link.url
                     else
-                      li
-                        a(href='/' + page + '/' + link.url, class=locals.pageSegment == link.url && 'active')= link.name
+                      - linkHref = '/' + page + '/' + link.url
+                    li
+                      a(href=linkHref, class=locals.pageSegment == link.url && 'active')= link.name
                   else
                     li.nav-header
                       if link.icon
                         i(class=link.icon)
                       span= link.name
-            include blocks/advertisements
+            include blocks/advertisements

tasks/docs.js

@@ -99,6 +99,12 @@ module.exports = function (grunt) {
         sidebars[0] = getSidebarSection('## API', 'icon-cog');
         sidebars[1] = getSidebarSection('### Other');
 
+        sidebars[1].push({
+          name: 'Github',
+          url: 'https://github.com/gruntjs/',
+          external: true
+        });
+
         names.forEach(function (name) {
           var src = base + name + '.md',
             dest = 'build/api/' + name.toLowerCase() + '.html';