Feat/community marketplace (#1790)

* add community marketplace

* Update embassy-mock-api.service.ts

* expect ui/marketplace to be undefined

* possible undefined from getpackage

* fix marketplace pages

* rework marketplace infrastructure

* fix bugs

Co-authored-by: Lucy C <12953208+elvece@users.noreply.github.com>

frontend/config-sample.json

@@ -9,10 +9,6 @@
     "mocks": {
       "maskAs": "tor",
       "skipStartupAlerts": true
-    },
-    "marketplace": {
-      "url": "https://registry.start9.com/",
-      "name": "Start9 Marketplace"
     }
   },
   "gitHash": ""