Copy examples directory into website directory on deploy

[jfrankl]

Currently, in the root directory of this project, are directories examples and website. The examples directory contains some examples of TextureMap being used with different geometry types. The website directory contains the website, which is the only part of the repository that is deployed by Netlify.

I think this structure for the project makes sense in terms of discoverability: examples in the root makes it easier to find. However, it would be handy to be able to publish these on the website so they'd appear at https://texturemap.org/examples.

Have we ever written a script like this on Netlify? I took a shot but couldn't get it work.