Set up Docker stack for figli_compta (Drupal + MariaDB + nginx)

Mirrors the leshed project's Docker layout. src/ is a git submodule
containing the Drupal codebase.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Docker/nginx/bashrc

@@ -0,0 +1,3 @@
+PS1='\e[36m\e[1mNGINX\e[0m:\e[90m\w\e[0m\n$ '
+bind '"\e[A": history-search-backward'
+bind '"\e[B": history-search-forward'