Compile a list of prospective multi-product guides to be featured in homepage

[niravcodes]

We want to teach features (call recording, AMD etc) using multiple products, and put those on the platform page AND feature them on the homepage. To that end, we need to compile the list of guides we want to prioritize.

[hey-august]

Core use case list provided by @ralox

1. Embed Calling and Video
2. Build Voice AI Agents
3. Route and Control Calls
4. Send Messages

These are cards that will soon appear on the Dashboard in a 'quickstart' area. See: https://github.com/signalwire/cloud-product/issues/20653