Document a bit more, move ping/ to the user's code

examples/hello_crystal/funko.cr

@@ -1,3 +1,16 @@
+require "kemal"
+ 
+# This is a kemal app, you can add handlers, middleware, etc.
+ 
+# A basic hello world get endpoint
 get "/" do
   "Hello World Crystal!"
 end
+
+# The `/ping/` endpoint is configured in the container as a healthcheck
+# You can make it better by checking that your database is responding
+# or whatever checks you think are important
+# 
+get "/ping/" do
+  "OK"
+end

runtimes/crystal/main.cr

@@ -1,8 +1,4 @@
 require "kemal"
 require "./funko.cr"
 
-get "/ping/" do
-  "OK"
-end
-
 Kemal.run