[#678] Updated .gitignore configs.

[AlexSkrypnyk]

Closes #678

This PR updates the root .gitignore managed by this project to "offload" scaffold files management, including exclusions of the contrib scaffold files, to Drupal Scaffold to minimise the maintenance effort for the consumer sites.

Please note that Drupal Scaffold now provides .gitignore files that exclude contrib directories. This PR tries to rely on the files provided by the Drupal Scaffold and only override what is really necessary for granular control within consumer projects.

Below is a table describing:

• Who provides the content of the file - where the files come from to the Consumer site
• Who manages the content of the file - updates to the file after they are downloaded
• Who ignores the file

DS == Drupal Scaffold
DP == Drupal Project (this template)
C == Consumer site

Path	Provided by	Managed by	Ignored by
.
├── .editorconfig	DS	DP/C	DP
├── .env.example	DP	DP	DP
├── .gitattributes	DS	DS	DP
├── .github
│   └── workflows	N/A	N/A
│   └── ci.yml	N/A	N/A
├── .gitignore	DP	DP
├── LICENSE	N/A	N/A
├── README.md	N/A	N/A
├── composer.json	DP	DP/C
├── composer.lock	N/A	N/A	N/A
├── drush
│   ├── Commands
│   │   └── PolicyCommands.php
│   ├── README.md
│   ├── drush.yml
│   └── sites
│   └── self.site.yml
├── load.environment.php
├── phpunit.xml.dist
├── scripts
│   └── composer
│   └── ScriptHandler.php
└── web
├── .csslintrc	DS	DS
├── .eslintignore	DS	DS
├── .eslintrc.json	DS	DS
├── .gitignore	DS	DS	DP
├── .ht.router.php	DS	DS
├── .htaccess	DS	DS
├── README.md	DS	DS
├── autoload.php	DS	DS
├── example.gitignore	DS	DS
├── index.php	DS	DS
├── core	DS	DS
├── modules
│   ├── .gitignore	DS	DS	DP
│   └── README.txt	DS	DS	DS
├── profiles
│   ├── .gitignore	DS	DS	DP
│   └── README.txt	DS	DS	DS
├── robots.txt	DS	DS	DS
├── sites
│   ├── .gitignore	DS	DS	DP
│   ├── README.txt	DS	DS	DS
│   ├── default
│   │   ├── .gitignore	DS	DS	DP
│   │   ├── default.services.yml	DS	DS	DS
│   │   ├── default.settings.php	DS	DS	DS
│   │   ├── files
│   │   └── settings.php	DS	DS	DS
│   ├── development.services.yml	DS	DS	DS
│   ├── example.settings.local.php	DS	DS	DS
│   └── example.sites.php	DS	DS	DS
├── themes
│   ├── .gitignore	DS	DS	DP
│   └── README.txt	DS	DS	DP
├── update.php	DS	DS	DS
└── web.config	DS	DS	DS

19 directories, 56 files

Please see inline comments for suggested changes.

[AlexSkrypnyk]

Providing this file in a template allows to have a "place" to put additional editor configurations.

[AlexSkrypnyk]

The local-specific overrides should be managed by users themselves using a global .gitignore. Ignoring vendor-specific entries make this selection biased, so it is better to exclude them from the list. The entries removed below.

[AlexSkrypnyk]

this and missed services.local.yml files are now managed with Drupal Scaffold .gitignore files created during composer install.

[AlexSkrypnyk]

Drupal Scaffold now provides .gitignore files for every directory used by contribs. This template now suggests relying on Drupal Scaffold to manage those ignores rather than managing them in consumer projects (which is, subjectively, easier to maintain).

[AlexSkrypnyk]

Important section

[AlexSkrypnyk]

The .gitignore provided by this template replaces the .gitignore provided by Drupal scaffold as an "example" since our files is an "extended example".

[AlexSkrypnyk]

Explicitly exclude both INSTALL and README as these files have been reported to be a source of identification of the Drupal version (on misconfigured servers), that opens an additional attack vector.

[leymannx]

Wow this is great stuff. Proper work and superbe comments! 👌🏻