doc: Add README.markdown as index page to API documentation.

Rakefile

@@ -35,7 +35,8 @@ module PrototypeHelper
     
     PDoc::Runner.new(temp_path, {
       :output    => DOC_DIR,
-      :templates => File.join(TEMPLATES_DIR, "html")
+      :templates => File.join(TEMPLATES_DIR, "html"),
+      :index_page => 'README.markdown'
     }).run
     
     rm_rf temp_path

templates/html/assets/stylesheets/core.css

@@ -291,15 +291,9 @@ pre code {
   
   .page-content .page-introduction {
     margin-left: 120px;
-    font-size: 15px;
     margin-bottom: 25px;
   }
   
-    .page-content .page-introduction p {
-      margin-top: 0;
-    }
-  
-
 .page-content .section {
   width: 955px;
   margin: 10px 0 20px;

templates/html/index.erb

@@ -1,12 +1,9 @@
 <% @title = "Home" %>
 
-<h2 class="page-title">Prototype API</h2>
-
 <div class="page-introduction">
-  <p>Welcome to the Prototype API Documentation.</p>
+  <%= @index_page_content %>
 </div> <!-- .section -->
 
-
 <div class="section section-sections">
   <div class="section-title">
     <h3>Sections</h3>