Work on #213

- properly categorize all patterns
- remove pattern list from readme
- minor fixes to readme
- removed "introduction" because its not a pattern and an error i
committed some time ago

layers/index.md

@@ -3,8 +3,8 @@ layout: pattern
 title: Layers
 folder: layers
 permalink: /patterns/layers/
-categories: architectural
-tags: pattern_tag
+categories: Architectural
+tags: Java
 ---
 
 **Intent:** Layers is an architectural style where software responsibilities are