Implement incremental build on data-triggered deploy

[andrewbridge]

https://github.com/hanbyul-here/nuxt-incremental-build-exp

Using a similar approach as the repo above, data-triggered deploys should make use of a cached build of the site. The web hook trigger should include a set of routes which should be regenerated (based on the data that's been deployed).

This would dramatically decrease data-triggered deploy times.

[andrewbridge]

https://stackoverflow.com/questions/3144647/git-show-all-files-changed-between-two-commits