Moved the 'add appointment' Psycopg2 examples to .callproc()

Moved the Flask container to Hy.  It works.  It works so well it deserves
a blog entry.

main.hy

@@ -0,0 +1,8 @@
+#!/usr/local/bin/hy
+
+(import [flask [Flask]])
+(def app (Flask __name__))
+(def hello ((.route app "/") (fn [] "Hello World")))
+(if (= __name__ "__main__")
+ (.run app))
+