WIP: Sales demo v3
This MR does a few things.
- It moves the existing I2P demo to the product handbook since Mark is the owner of this demo experience.
- It adds a link from the product handbook to the new I2P demo page
- It updates the sales demo page to include the proposed sales demo which has a shorter setup, a section on instance administration, and 2 demo flows (1 for legacy VCS and another for DevOps/CD)
Sales and success engineers, please watch the video walkthrough to review the demo script and leave feedback on this merge request.