Introducing a filter for Integration type and adding Layer Author Guide

[adhamfarrag]

As Nuxt Layers is a relatively new concept, and good percentage of users are not familiar with it. It will be very useful to offer an experience highlighting that Nuxt has a new integration type.

Suggested solution: Updating the current experience with a filter for integration types (modules/layers) along with a link to the current reference or authoring a guide and listing it.