feat: Adding Traefik reverse proxy

[Akilditu]

This PR aims at adding Traefik reverse proxy so that we can secure platform app.

Major improvements are :

• Add of Traefik service in main docker-compose.yml
• Creation of external web network so that Traefik can communicate with the frontend service through 8050 port exposure
• Add of dev mode with new make run_dev command
• Add of a new docker-compose-dev.yml file without Traefik service to avoid any conflict while development on localhost
• Update of Readme so that everyone who contributes know how to use this new config

Thanks a lot for the review !

[MateoLostanlen]

Hi @Akilditu , thanks a lot for this PR. For my part, the platform works well at https://platform.pyronear.org/ and locally using make run_dev.

Just one small point before validating, couldn't you adapt the docker CI so that it runs like run_dev?