`gatsby-plugin-prefetch-google-fonts` is depracated

[luxumbra]

The build broke when I was looking at merging a dependabot PR.

I have also created a develop branch for any development going forwards - I hope you don't mind me going ahead with that, @hammadj.

@peth-yursick has asked me to work on building out the 'app drawer' nav, so thought best place for that would be here and branched from develop. I know you're super busy, so didn't want to trouble you.