Remove GCP arch viz since it's moved to Forseti (GoogleCloudPlatform#484

)

* Remove GCP arch viz since it's moved to Forseti

* Revert "Remove GCP arch viz since it's moved to Forseti"

This reverts commit 3c4c85d.

* Remove arch viz and update root README

README.md

@@ -73,7 +73,7 @@ The tools folder contains ready-made utilities which can simpilfy Google Cloud P
 * [GCE Disk Encryption Converter](tools/gce-google-keys-to-cmek) - A tool that converts disks attached to a GCE VM instnace from Google-managed keys to a customer-managed key stored in Cloud KMS.
 * [GCE Quota Sync](tools/gce-quota-sync) - A tool that fetches resource quota usage from the GCE API and synchronizes it to Stackdriver as a custom metric, where it can be used to define automated alerts.
 * [GCE Usage Log](tools/gce-usage-log) - Collect GCE instance events into a BigQuery dataset, surfacing your vCPUs, RAM, and Persistent Disk, sliced by project, zone, and labels.
-* [GCP Architecture Visualizer](/tools/gcp-arch-viz) - A tool that takes CSV output from a Forseti Inventory scan and draws out a dynamic hierarchical tree diagram of org -> folders -> projects -> gcp_resources using the D3.js javascript library.
+* [GCP Architecture Visualizer](https://github.com/forseti-security/forseti-visualizer) - A tool that takes CSV output from a Forseti Inventory scan and draws out a dynamic hierarchical tree diagram of org -> folders -> projects -> gcp_resources using the D3.js javascript library.
 * [GCP Organization Hierarchy Viewer](tools/gcp-org-hierarchy-viewer) - A CLI utility for visualizing your organization hierarchy in the terminal.
 * [GCS Bucket Mover](tools/gcs-bucket-mover) - A tool to move user's bucket, including objects, metadata, and ACL, from one project to another.
 * [GCS Usage Recommender](tools/gcs-usage-recommender) - A tool that generates bucket-level intelligence and access patterns across all projects for a GCP project to generate recommended object lifecycle management.