Update the link to F-List to point to the current repository

Testing Done:
Ran locally.

Bugs closed: NEST-40

Reviewed at
title: Building
date: 2019-01-11T05:44:25.000Z
anchor: building
weight: -100
lastmod: 2019-09-04T03:42:40.000Z
Building Pidgin can be tricky, but hopefully we've made it pretty clear in the
following pages. First thing first is that we you need to decide which version
of Pidgin you are going to build.
If you are just trying to build Pidgin to run it, then you probably want the
[2.x.y](2.x.y/) release which is our stable version.
If you're interested in developing Pidgin itself or just want to live on the
edge then you may want to try out the development version which we call