Add a Makefile option to leverage gatsby live development server

[JulesAaelio]

Gatsby provide a live development server but not logs are showed when starting the project.

Expected Behavior

It would be nice having the Gatsby live development server logs.

Current Behavior

Docker container is started but console is not attached to it , so no logs shows up automatically.

Possible Solution

Add a develop command in Makefile to start container and attach to it (docker-compose up)

Context

Working on #4 with PR #8