Remove old files

backend/envoy/envoy(dapr).yaml

backend/envoy/envoy.yaml

backend/gateway/.dockerignore

backend/gateway/Dockerfile

backend/gateway/Dockerfile.dev

backend/gateway/README.txt

backend/gateway/package-lock.json

backend/gateway/package.json

backend/gateway/protos/README.md

backend/gateway/protos/v3/projector.proto

backend/gateway/src/database.js

backend/gateway/src/generated/projector_grpc_pb.js

backend/gateway/src/generated/projector_pb.js

backend/gateway/src/index(OLD).js

backend/gateway/src/index.js

backend/gateway/src/webSocketGateway.js

backend/projector/.dockerignore

backend/projector/Dockerfile

backend/projector/Dockerfile.dev

backend/projector/package-lock.json