Refactor Dockerfile and docker-compose for improved build process and clarity

docker-compose.yaml

@@ -6,9 +6,9 @@ services:
     container_name: black_hole_share
     volumes:
       - ./data:/data
-      - ./src:/data/src
-      - ./Cargo.lock:/data/Cargo.lock
-      - ./Cargo.toml:/data/Cargo.toml
+      - ./src:/opt/bhs
+      - ./Cargo.lock:/opt/bhs/Cargo.lock
+      - ./Cargo.toml:/opt/bhs/Cargo.toml
       - /etc/localtime:/etc/localtime:ro
 
     labels: