Dynamically build main Markdown file

[jissereitsma]

The current setup of this repo is that there is a single Markdown file, holding all information. As discussed with @DavidLambauer, there could be a huge benefit of splitting up the resources into smaller files (Markdown, CSV, JSON) and using a build tool to parse these resources into the main README.md file. The smaller resource files (like an events.json, an extensions.csv file or simply a about-magento.md file) could then be used elsewhere (remote feeds, website generators) as well.

[jissereitsma]

Perhaps add all of the resources into a folder called resources/. The MVP for this would be two Markdown files in that resources/ folder that are then merged together by a build tool, to override the README.md file. The build tool could be built with Laravel Zero, and automatically run via GitHub Actions with every PR.