docs: Explain how to use the plugin within a Faust project

[ahuseyn]

Documentation should explain the how to use HWP Previews plugin alongside with Faust. It should cover the non-exhaustive questions below:

• Why the new plugin is a better solution?
• How to configure Faust and the plugin?
• How to avoid any conflict with Faust preview feature?
• How to use iframe feature with Faust redirects

[ahuseyn]

@colinmurphy HWP Previews having a conflict with Faust previews. Documented in #233
We need to decide how to handle this issue before proposing a recommended approach with Faust.

[ahuseyn]

Just a note: When using HWP Previews in iframe within a Faust project, Faust auth enabled, each time it redirects to login page inside iframe.

[colinmurphy]

Thanks for testing this @ahuseyn ❤

Yes let's talk today and discuss options as a team on how we could potentially fix this issue 👍