Move move .emacs.d out of configs/shared

Moving all of my Emacs-related files into their own directory at the root of
this repository.

emacs/.emacs.d/snippets/java-mode/public-static-void-main

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: public static void main
+# key: psvm
+# --
+public static void main(String[] args) {
+    $1
+}