Introduce dynamic DOCROOT

[elvism-lullabot]

The web directory is hardcoded in some places which makes the non-web dir projects run into errors, here are some places I found:

playwright-drupal/tasks/playwright.yml

Lines 57 to 59 in 6ebb053

	rm -rf web/sites/simpletest/{{ shellQuote .test_id }}/
	mkdir -p web/sites/simpletest/{{ shellQuote .test_id }}/
	mkdir -p /tmp/sqlite/{{ shellQuote .test_id }}/

playwright-drupal/tasks/playwright.yml

Lines 65 to 66 in 6ebb053

	cp -a web/sites/default/*.php web/sites/simpletest/{{ shellQuote .test_id }}/
	cp -a web/sites/default/*.yml web/sites/simpletest/{{ shellQuote .test_id }}/

playwright-drupal/tasks/playwright.yml

Lines 118 to 119 in 6ebb053

	while [ -d web/sites/simpletest/{{ shellQuote .test_id }}/ ]; do
	rm -rf web/sites/simpletest/{{ shellQuote .test_id }}/ 2>/dev/null || true

playwright-drupal/bin/drush-playwright-internal

Line 42 in 6ebb053

include_once '/var/www/html/web/core/includes/bootstrap.inc';