Unlock boilerplate

[shelane]

It would be really great if we don't need to commit the vendor directory and keep the lock file up-to-date so that whenever a user initiates a new project from this boilerplate, they will get the latest packages available based on composer version/package requirements. This may be occasionally updating the composer.json file, but that is far less onerous.

I attempted to do this locally, but got the error:

Loading composer repositories with package information                                                                                                                                             GitHub API limit (0 calls/hr) is exhausted, could not fetch https://api.github.com/repos/getgrav/PHP-Markdown-Documentation-Generator/contents/composer.json?ref=8ae1f878ec6f8045899a9bc50029dada1017d616. Create a GitHub OAuth token to go over the API rate limit. You can also wait until ? for the rate limit to reset.

When working with _public_ GitHub repositories only, head to https://github.com/settings/tokens/new?scopes=&description=Composer+on+cli+2022-04-23+1735 to retrieve a token.
This token will have read-only permission for public information only.
When you need to access _private_ GitHub repositories as well, go to https://github.com/settings/tokens/new?scopes=repo&description=Composer+on+cli+2022-04-23+1735
Note that such tokens have broad read/write permissions on your behalf, even if not needed by Composer.
Tokens will be stored in plain text in "/home/docker/.composer/auth.json" for future use by Composer.
For additional information, check https://getcomposer.org/doc/articles/authentication-for-private-packages.md#github-oauth
Token (hidden): 
Deprecation Notice: trim(): Passing null to parameter #1 ($string) of type string is deprecated in phar:///usr/local/bin/composer2/src/Composer/Util/GitHub.php:104
No token given, aborting.
You can also add it manually later by using "composer config --global --auth github-oauth.github.com <token>"
                                             
  [Composer\Downloader\TransportException]   
  Could not authenticate against github.com