Explain custom Project Settings in .env file that are not inherited from wodby.

[rsanzante]

Those are settings in the .env.example file.

### PROJECT SETTINGS

PROJECT_NAME=example
PROJECT_BASE_URL=example.docker.localhost
DOCKER_PROJECT_ROOT=/var/www/html
THEME_PATH=/var/www/html/web/themes/custom/example
NPM_RUN_COMMAND=dev
DEFAULT_DRUSH_ALIAS=example.stg

However, is not clear what is the use of some them:

THEME_PATH: What is the purpose? I guess is related to the frontend rebuild, but what should a new user put here? What if there's no custom theme? Maybe because is not yet created.

DEFAULT_DRUSH_ALIAS: I guess this alias is used for some operations as a default value, but I think it would be interesting to have more info about it.