Move all samples to the root dir

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

nginx-golang/frontend/Dockerfile

@@ -0,0 +1,4 @@
+FROM nginx:alpine 
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+

nginx-golang/frontend/nginx.conf

@@ -0,0 +1,6 @@
+server {
+  listen 80;
+  location / {
+    proxy_pass http://backend:80;
+  }
+}