Update default template to Drupal 8

Co-Authored-By: Luís Pedro Algarvio <lp@algarvio.org>

Drupal.gitignore

@@ -1,39 +1,46 @@
-# Ignore configuration files that may contain sensitive information.
-sites/*/*settings*.php
-sites/example.sites.php
+# gitignore template for Drupal 8 projects
+#
+# earlier versions of Drupal are tracked in `ecosystem/Python/`
 
-# Ignore paths that contain generated content.
-files/
-sites/*/files
-sites/*/private
-sites/*/translations
+# Ignore configuration files that may contain sensitive information
+/sites/*/*settings*.php
+/sites/*/*services*.yml
 
-# Ignore default text files
-robots.txt
-/CHANGELOG.txt
-/COPYRIGHT.txt
-/INSTALL*.txt
+# Ignore paths that may contain user-generated content
+/sites/*/files
+/sites/*/public
+/sites/*/private
+/sites/*/files-public
+/sites/*/files-private
+
+# Ignore paths that may contain temporary files
+/sites/*/translations
+/sites/*/tmp
+/sites/*/cache
+
+# Ignore drupal core (if not versioning drupal sources)
+/core
+/modules/README.txt
+/profiles/README.txt
+/sites/README.txt
+/sites/example.sites.php
+/sites/example.settings.local.php
+/sites/development.services.yml
+/themes/README.txt
+/vendor
+/.csslintrc
+/.editorconfig
+/.eslintignore
+/.eslintrc.json
+/.gitattributes
+/.htaccess
+/autoload.php
+/composer.json
+/composer.lock
+/example.gitignore
+/index.php
 /LICENSE.txt
-/MAINTAINERS.txt
-/UPGRADE.txt
 /README.txt
-sites/README.txt
-sites/all/libraries/README.txt
-sites/all/modules/README.txt
-sites/all/themes/README.txt
-
-# Ignore everything but the "sites" folder ( for non core developer )
-.htaccess
-web.config
-authorize.php
-cron.php
-index.php
-install.php
-update.php
-xmlrpc.php
-/includes
-/misc
-/modules
-/profiles
-/scripts
-/themes
+/robots.txt
+/update.php
+/web.config