Remove Java guides

The Java guides were just style guides that haven't been touched in
years. It's time to let this go.

Author: JoelQ

README.md

@@ -47,7 +47,6 @@ programming in style.
 - [HAML](/haml/)
 - [Haskell](/haskell/)
 - [HTML](/html/)
-- [Java](/java/)
 - [JavaScript & TypeScript](/javascript-typescript/)
 - [Objective-C](/objective-c/)
 - [Python](/python/)