Finish packaging and change to src-based packaging layout, replace caddy with haproxy for performance, and update docker-compose and Dockerfiles for new packaging.

haproxy/haproxy.dev.cfg

@@ -0,0 +1,18 @@
+defaults
+  mode http
+  timeout client 10s
+  timeout connect 5s
+  timeout server 10s 
+  timeout http-request 10s
+
+frontend cf
+  bind :8000
+  default_backend django
+
+backend django
+  option httpchk
+  http-check send meth GET  uri /health/
+  http-check expect string OK/HEALTHY
+  default-server check maxconn 10000 observe layer7 
+  server django web:8000
+