(maint) Remove viz.js

This commit removes the viz.js dependency that was missed in #613.

Author: jpogran

package-lock.json

@@ -568,12 +568,11 @@
     "cytoscape": "3.14.0"
   },
   "dependencies": {
+    "axios": "0.19.0",
     "jsonc-parser": "~2.1.0",
-    "viz.js": "~1.7.0",
     "vscode-debugadapter": "^1.19.0",
     "vscode-debugprotocol": "^1.19.0",
     "vscode-extension-telemetry": "0.1.2",
-    "vscode-languageclient": "^5.2.1",
-    "axios": "0.19.0"
+    "vscode-languageclient": "^5.2.1"
   }
 }