Remove invoke (#705)

The invoke team already maintains a docker setup for their service, this
copy here was maybe relevant 2 years ago when all of this started, but I
don't think it makes sense anymore.

Refer to invoke's docs to install using docker
https://invoke-ai.github.io/InvokeAI/installation/040_INSTALL_DOCKER/

docker-compose.yml

@@ -38,22 +38,6 @@ services:
     environment:
       - CLI_ARGS=--no-half --precision full --allow-code --enable-insecure-extension-access --api
 
-  invoke: &invoke
-    <<: *base_service
-    profiles: ["invoke"]
-    build: ./services/invoke/
-    image: sd-invoke:31
-    environment:
-      - PRELOAD=true
-      - CLI_ARGS=--xformers
-
-  # invoke-cpu:
-  #   <<: *invoke
-  #   profiles: ["invoke-cpu"]
-  #   environment:
-  #     - PRELOAD=true
-  #     - CLI_ARGS=--always_use_cpu
-
   comfy: &comfy
     <<: *base_service
     profiles: ["comfy"]