Add AI guidelines to Launch

**What is the work that needs to be done?**

Add Launch-specific AI guidance to the prep material. [This has been done for ITP already as an example.](https://curriculum.codeyourfuture.io/itp/welcome/prep/#acceptable-ai-use)
The [full AI guidance can be found linked in the guides](https://curriculum.codeyourfuture.io/guides/ai-usage/).

Use the full AI guidance to find the section specific to Launch. Use this section to create prep material that points people in the right direction.

**Why is this work important to do?**

AI use is expected to evolve as student's move through the courses and students need to be guided through how best to use AI for the learning goals of the course they're in. Because the use of AI expected to evolve we have to remind students of the expectations for the specific course they are in.