Remove video intelligence from the monorepo. (#2694)

Ironically, _add_ it to README.md.

Author: lukesneeringer

README.md

@@ -22,6 +22,7 @@ This client supports the following Google Cloud Platform services at a [Beta](#v
 * [Cloud Firestore](https://github.com/googleapis/nodejs-firestore/) (Beta)
 * [Cloud Pub/Sub](#cloud-pubsub-beta) (Beta)
 * [Cloud Spanner](#cloud-spanner-beta) (Beta)
+* [Cloud Video Intelligence](https://github.com/googleapis/nodejs-video-intelligence/) (Beta)
 * [Cloud Vision](#cloud-vision-beta) (Beta)
 * [Google BigQuery](#google-bigquery-beta) (Beta)
 * [Google Stackdriver Monitoring](https://github.com/googleapis/nodejs-monitoring) (Beta)