chore: Data Mocking for Study List (#1515)

* feat: Data mocking for studies

* feat: Data Mocking for Study List

* fix empty study position

* rename variables for numOfStudies

* fix studies query

* remove alert :|

* minor refactor

* split utils and refactoring

* refactoring -- format, clean up icons, mdx mock

platform/ui/package.json

@@ -26,6 +26,7 @@
   },
   "dependencies": {
     "classnames": "^2.2.6",
+    "date-fns": "^2.10.0",
     "docz": "^2.2.0",
     "theme-ui": "^0.2.38",
     "gatsby": "2.19.24",