Update phpDoc links

_docs/contribute.md

@@ -10,4 +10,4 @@ Are you are interested in contributing to the development of Pico?
 
 For the basics of creating a **plugin**, **theme** or even contributing to the **Pico core**, we've setup a comprehensive set of [development documentation](/plugin-dev.html) to get you started.
 
-You may also see our [class documentation](/phpDocumentor) for a deeper understanding of Pico's underlying code.
+You may also see our [class documentation]({{ site.base_url }}/phpDoc/master) for a deeper understanding of Pico's underlying code.

plugin-dev.html

@@ -9,7 +9,7 @@ nav: 3
     <div class="inner">
         <h1 class="aligncenter">Create your own plugins &amp; themes</h1>
         <p class="description aligncenter">
-            Below is our developer documentation, you may also refer to Pico's <a href="phpDocumentor/">class documentation</a>
+            Below is our developer documentation, you may also refer to Picos <a href="{{ site.base_url }}/phpDoc/master/">class documentation</a>
         </p><br />
 
         <div class="one-fourth">