[INFRA-209] Remove nginx related configurations from plane community (#7406)

* Remove deprecated Nginx configuration files and scripts, including Dockerfiles, environment scripts, and configuration templates, to streamline the project structure.

* Update environment configuration and Docker setup for proxy services

- Added LISTEN_PORT and LISTEN_SSL_PORT variables to .env.example and related files.
- Updated Docker Compose files to reference new port variables instead of deprecated NGINX_PORT.
- Adjusted README and variable documentation to reflect changes in port configuration.
- Changed build context for proxy services to use the new directory structure.

* Refactor port configuration in environment and Docker files

- Renamed LISTEN_PORT and LISTEN_SSL_PORT to LISTEN_HTTP_PORT and LISTEN_HTTPS_PORT in .env.example and related files.
- Updated Docker Compose configurations to reflect the new port variable names.
- Adjusted documentation in README and variables.env to ensure consistency with the new naming conventions.

docker-compose-local.yml

@@ -199,13 +199,14 @@ services:
 
   # proxy:
   #   build:
-  #     context: ./nginx
-  #     dockerfile: Dockerfile.dev
+  #     context: ./apps/proxy
+  #     dockerfile: Dockerfile.ce
   #   restart: unless-stopped
   #   networks:
   #     - dev_env
   #   ports:
-  #     - ${NGINX_PORT}:80
+  #     - ${LISTEN_HTTP_PORT}:80
+  #     - ${LISTEN_HTTPS_PORT}:443
   #   env_file:
   #     - .env
   #   environment: