People keep finding the v4 legacy docs at docs.videojs.com/docs and Google keeps positioning them highly in search results. This attempts to lessen that.
This adds in the legacy docs into the repo and enables automatic deployment via netlify. The netlify-docs.js script will error out the build on netlify on master if we're not on a tagged commit so that it won't redeploy the docs unless there's a new release. If we're not on master or on master with a tagged commit, it will process with the deploy.
Also, this removes the API docs from being published with npm, fixes#4609.
