Can’t build from root lectures directory #1

Building in each individual lecture’s directory is fine, e.g:

cd lec01
gradle

But building all lectures in the lecture root directory doesn’t work, because build.gradle.kts tries to import lecture.gradle.kts, which only exists in the lecture subdirectories.

The solution might be to make the lecture infrastructure a script plugin instead. Then instead of symlinks, each lecture can have its own small build.gradle.kts that just declares the plugin, plus any custom build logic that currently goes in lecture.gradle.kts.

The root build.gradle.kts would not declare the plugin, relying on the subprojects for that.

See:

• https://stackoverflow.com/questions/30761299/gradle-how-to-include-an-existing-complete-project-as-a-subproject
• https://docs.gradle.org/current/samples/sample_convention_plugins.html