Rewrite README, build from compose, drop proxy network

- README: rewritten for this fork — build with docker compose, clone
  ComfyUI yourself as the mount, gfx1201 (RX 9700) confirmed working
- docker-compose.yml: add build: context, local image tag, ./ComfyUI
  volume, restore shm_size/render group/ipc, remove external
  proxy-network
- docker-run.sh: build locally, matching image tag and container name
- add .gitignore for the ComfyUI mount

docker-run.sh

@@ -1,6 +1,13 @@
 #!/bin/bash
+# Alternative to docker compose: build and run manually.
+# Clone ComfyUI into ./ComfyUI first:
+#   git clone https://github.com/comfyanonymous/ComfyUI
 
-docker run -it \
+set -e
+
+docker build -t comfyui-gfx1151:v0.8 .
+
+docker run -it --rm \
   --cap-add=SYS_PTRACE \
   --security-opt seccomp=unconfined \
   --device=/dev/kfd \
@@ -12,5 +19,5 @@ docker run -it \
   -p 8188:8188 \
   -v $(pwd)/ComfyUI:/opt/ComfyUI \
   --shm-size 8G \
-  --name comfyui-gfx1151 \
-  ignatberesnev/comfyui-gfx1151:v0.2
+  --name comfyui \
+  comfyui-gfx1151:v0.8