Also add katex to remote deps

microsoft#261339 (comment)

Author: mjbvz

remote/package-lock.json

@@ -29,6 +29,7 @@
     "http-proxy-agent": "^7.0.0",
     "https-proxy-agent": "^7.0.2",
     "jschardet": "3.1.4",
+    "katex": "^0.16.22",
     "kerberos": "2.1.1",
     "minimist": "^1.2.8",
     "native-watchdog": "^1.4.1",