[backend] added logic for unified Docker image
[backend] removed reference to separated Docker images
[backend] removed FRONTEND_PROTOCOL and FRONTEND_HOST env variables and added ENDURAIN_HOST
[backend] fixed issue on profile and health_data routes
[backend] bump version to v0.7.0
[frontend] bump version to v0.7.0
[frontend] changed env variables logic to use STRAVA_CLIENT_ID and ENDURAIN_HOST from backend logic
[frontend] removed frontend env variables logic on docker compose
[frontend] changed logic to use new env variables logic
[docker] added new unified docker image logic
[docker] updated docker compose example file to use single image logic