Add setup and compiler documentation + credits

Author: Blixibon

_config.yml

@@ -38,7 +38,7 @@ plugins:
 
 header_pages:
   - about.markdown
-  - getting-started.markdown
+  - setup.markdown
   - docs.markdown
   - credits.markdown
 

_includes/docs_feature_button_big.html

@@ -4,7 +4,7 @@
 				<span class="feature_background" style="background-image: url('{{ include.bg }}')"></span>
 				<span class="feature_background_color"></span>
 				<div style="width:20%;">
-					<img class="feature_icon" src="{{ "/" | relative_url }}{{ include.icon }}"/>
+					{% if include.icon contains '.' %}<img class="feature_icon" src="{{ "/" | relative_url }}{{ include.icon }}"/>{% else %}<span class="feature_icon_text">{{ include.icon }}</span>{% endif %}
 				</div>
 				<div class="feature_text" style="font-size:20px;">
 					<p>{{ include.text }}</p>