refactor: 💡 port mirage mocks into api addon

addons/api/README.md

@@ -23,6 +23,15 @@ This addon contains the API data access layer for Boundary.
 Add this addon to an Ember application's `devDependencies` as:
 `"api": "*"`, for applications included in this monorepo.
 
+Since this addon also includes Mirage mocks, be sure to install
+`ember-cli-mirage` and add the following config to your UI project:
+
+```js
+'ember-cli-mirage': {
+  directory: '../../addons/api/mirage'
+}
+```
+
 ## Installation
 
 See monorepo README for installation instructions.

ui/admin/config/environment.js

@@ -80,6 +80,10 @@ module.exports = function (environment) {
       'media-src': ["'self'"],
       'manifest-src': ["'self'"],
     },
+
+    'ember-cli-mirage': {
+      directory: '../../addons/api/mirage'
+    }
   };
 
   // Unsafe policy is necessary in development and test environments, but should