Promoting GSoC2023 project ideas from "Draft" to "Published"

As discussions about new project ideas or their content dried out, I prepared a pull request to update most of the GSoC 2023 project ideas from “Draft” to “Published” status.

This doesn’t change the way we will handle mentoring for proposal preparation on those project ideas. We will discuss the draft ideas as the other ideas during the upcoming GSoC Office Hours sessions.

/- Jmm