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

private-class-data/index.md

@@ -3,8 +3,8 @@ layout: pattern
 title: Private Class Data
 folder: private-class-data
 permalink: /patterns/private-class-data/
-categories: pattern_cat
-tags: pattern_tag
+categories: Other
+tags: Java
 ---
 
 **Intent:** Private Class Data design pattern seeks to reduce exposure of