Nuke old Docker stuff (#1104)

* Remove old Docker stuff

* Move hub stuff to upper level docker directory

* Build monolith images

* Update README.md

* Update paths

* Update README.md

build/docker/docker-compose.monolith.yml

@@ -0,0 +1,18 @@
+version: "3.4"
+services:
+  monolith:
+    hostname: monolith
+    image: matrixdotorg/dendrite:monolith
+    command: [
+      "--config=dendrite.yaml",
+      "--tls-cert=server.crt",
+      "--tls-key=server.key"
+    ]
+    volumes:
+      - ./config:/etc/dendrite
+    networks:
+      - internal
+
+networks:
+  internal:
+    attachable: true