🔧(devx) stop declaring LiveKit as an app-dev dependency

LiveKit was declared as an app-dev dependency, which caused it
(along with its egress) to be started whenever we ran unrelated
commands such as tests, migrate or makemigrations.

Drop that dependency and start LiveKit explicitly only when it is
actually needed, i.e. when calling run-backend.

Makefile

@@ -133,6 +133,7 @@ logs: ## display app-dev logs (follow mode)
 run-backend: ## start only the backend application and all needed services
 	@$(COMPOSE) up --force-recreate -d celery-dev --remove-orphans
 	@$(COMPOSE) up --force-recreate -d nginx
+	@$(COMPOSE) up -d livekit
 	@echo "Wait for postgresql to be up..."
 	@$(WAIT_DB)
 .PHONY: run-backend

compose.yml

@@ -85,7 +85,6 @@ services:
         - postgresql
         - mailcatcher
         - redis
-        - livekit
         - createbuckets
         - createwebhook
     extra_hosts: