Update `!free` tag

[ikuyarihS]

Problem

With the introduction of #how-to-get-help - we can safely update the content of the !free tag, right now the content is this:

Proposal

Let's include the id of the #how-to-get-help into the tag

The tag can be found here: https://github.com/python-discord/bot/blob/master/bot/resources/tags/free.md

[kwzrd]

That's a good idea. I'll try to figure something out.