Merge into main, not into gh-pages

Line 112 in 5084e86

    
           2.  Within your version of the forked repository, move to the `gh-pages` branch and

The above line in Contributing states that PRs should come from branches originating from gh-pages, but I think (looking at commit history on this repo) that branches are being merged into master instead, right?

It's actually 'main' now. Definitely not gh-pages. A PR to make that revision would be welcome.

Okiedoke, thanks!

Closed via #193