Set urls from config file (#1151)

* Set environment URLs in webpack config.

* Provide non NULL dev server

* QA env uses the pq TLD

* Include icons in qa env

* Move base configs to develop.

local configurations should be done in the `./config/local.json` file.

* Fix config override loading to default to development

* Standardize url formatting

* Limit QA settings to those set in production

* Set self hosted in a config

* Specify cloud instead of production

Self hosted and cloud are both production environments.
The ENV setting is used to specify the env type while
NODE_ENV specifies whether development error handling and services.

* Update config instructions

* Remove invalid json

* Change env `production` references to `cloud`

* Fix formatting

config/development.json

@@ -0,0 +1,11 @@
+{
+    "proxyApi": "http://localhost:4000",
+    "proxyIdentity": "http://localhost:33656",
+    "proxyEvents": "http://localhost:46273",
+    "proxyNotifications": "http://localhost:61840",
+    "proxyEnterprise": "http://localhost:52313",
+    "allowedHosts": [],
+    "urls": {
+        "enterprise": "http://localhost:52313"
+    }
+}