New address for the funnelback docs

Problem/Motivation

The URL for the funnelback docs has changed so following the link on the project page takes you to a 404 page.

Steps to reproduce

Open the project page and follow the link.

Proposed resolution

Change the link on the project page to the new URL:
https://docs.squiz.net/funnelback/archive/15.24/analyse/accessibility/in...

Remaining tasks

Update the page