Move the Hello World lua app to its own recipe

Use it in the development environment

site-cookbooks/kosmos_openresty/recipes/hello_world.rb

@@ -0,0 +1,9 @@
+#
+# Cookbook:: kosmos_openresty
+# Recipe:: hello_world
+#
+
+openresty_site 'hello_world' do
+  template 'hello_world.conf.erb'
+  action :enable
+end