Add contribute button

Author: hwkr

src/drawer.html

@@ -39,20 +39,11 @@
       <!-- Repository -->
       {% if repo_name == "GitHub" and repo_url %}
         <ul class="repo">
-          <li class="repo-download">
-            {% if config.extra.github and config.extra.github.download_release %}
-              {% set version = config.extra.version | default("../latest") %}
-              <a href="{{ repo_url }}/releases/tag/{{ version }}" target="_blank"
-                title="Download" data-action="download">
-                <i class="icon icon-download"></i> Download
+          <li class="repo-contribute">
+              <a href="{{ repo_url }}#contributing" target="_blank"
+                title="Contirbute" data-action="contribute">
+                <i class="icon icon-note"></i> Contibute
               </a>
-            {% else %}
-              {% set version = config.extra.version | default("master") %}
-              <a href="{{ repo_url }}/archive/{{ version }}.zip" target="_blank"
-                title="Download" data-action="download">
-                <i class="icon icon-download"></i> Download
-              </a>
-            {% endif %}
           </li>
           <li class="repo-stars">
             <a href="{{ repo_url }}/stargazers" target="_blank"