refactor: 统一环境变量命名并整理配置文件格式

1. 将所有环境变量中的Volumes_PATH统一改为Volumes_Path
2. 把旧的.env.cnf文件重命名为.env.cfg
3. 将compose.yaml文件统一替换为stack.yml/compose.yml格式
4. 删除冗余的旧版compose配置文件

searxng/stack.yml

@@ -12,7 +12,7 @@ services:
     networks:
       - searxng
     volumes:
-      -  ${Volumes_PATH}/redis-data:/data
+      -  ${Volumes_Path}/redis-data:/data
 
   searxng:
     image: ${SearXNG_TAG}
@@ -28,8 +28,8 @@ services:
     networks:
       - searxng
     volumes:
-      - ${Volumes_PATH}/etc-searxng:/etc/searxng:rw
-      - ${Volumes_PATH}/searxng-data:/var/cache/searxng:rw
+      - ${Volumes_Path}/etc-searxng:/etc/searxng:rw
+      - ${Volumes_Path}/searxng-data:/var/cache/searxng:rw
 
 networks:
   searxng: