* docs: ADR for new course apps API
This ADR proposes a new course apps API that is driven by a new coruse app
plugin type.
* Updated based on feedback
* Major changes to document structure
* Review feedback
* feat: Course Apps API
This adds a new concept called course apps. These are exposed via a new
"openedx.course_app" entrypoint, which helps the LMS and studio discover such
apps and list them in a new rest api for the same.
These course apps will drive the pages and resources view in the course authoring
MFE. This system will track which apps are enabled and which are disabled. It
also allows third-party apps to be listed here by using the plugin entrypoint.
* Apply feedback from review
