Add a link to the Forum (and Support GitBook) to the Forum

[petersampsonaudacity]

Forum ELF Koz (Greg Kozikowski) wrote offline suggesting that it would be good if a link to the Manual could be added to the Audacity Forum.

This is effectively a regression as the old Forum did have such a useful link.

To which I would add: I suggest also adding a link to the Support GitBook site.

[LWinterberg]

good call

[petersampsonaudacity]

Brilliant (and fast) - thanks @LWinterberg