Added configs page and updated sidebar

Author: JohannesMP

docs/_includes/sidebar.html

@@ -14,6 +14,7 @@
 
   <ul class="routes">
     <li><a href="{{ "/" | relative_url }}" {% if page.url == '/' %}class="active"{% endif %}>Index</a></li>
+    <li><a href="{{ "/configs" | relative_url }}" {% if active[1] == 'configs' %}class="active"{% endif %}>Configs</a></li>
     <li><a href="{{ "/api" | relative_url }}" {% if active[1] == 'api' %}class="active"{% endif %}>API</a></li>
     <li><a href="{{ "/frontend" | relative_url }}" {% if active[1] == 'frontend' %}class="active"{% endif %}>Front End</a>
       <ul>

docs/configs.md

@@ -0,0 +1,25 @@
+---
+title: Configuration Options
+permalink: /configs/
+--- 
+
+Jekyll Admin related options can be specified in `_config.yml`
+under a key called `jekyll_admin`.
+
+### Config Options
+
+#### `hidden_links`
+
+For hiding unwanted links on the sidebar. 
+
+The following keys under `hidden_links` can be used in order to hide default links:
+
+```yaml
+jekyll_admin:
+  hidden_links:
+    - posts
+    - pages
+    - staticfiles
+    - datafiles
+    - configuration
+```