Add Beamer for in Dapp Feature Announcements + Move docs

[arrenv]

Description

This PR is a quick and not so good integration of 3rd-party tool Beamer. The idea is to gain some insights prior to moving to CDApp.

To test, you should see a right side panel appear when clicking What's New, or Report Bugs, in the AvatarDropdown. Note, these will trigger different tabs with an update coming from Beamer. You can also trigger the bar from clicking "We love feedback" in the bottom right of the screen.

New stuff ✨

• Added in app feature requests news using Beamer.

Changes 🏗

• Changed links in AvatarDropdown and the "We love feedback" to trigger in app feature requests and updates.
• Changed Gitbook links to the new docs.

Deletions ⚰️

• Removed refences to ProductBoard external feature requests

Contributes to #4101

[CLAassistant]

All committers have signed the CLA.