Move all samples to the root dir

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

nginx-flask-mysql/backend/hello.py

@@ -0,0 +1,6 @@
+from flask import Flask
+app = Flask(__name__)
+
+@app.route('/')
+def hello_world():
+    return 'Hello world'