Changes to documentation (#2209)

* refactored Storybook UI

* refactored Storybook UI

* removed extra cards from the doc, added card for ui components

* added hover behavior to doc page & made it look selected

* separate storybook docs and tests

* separating storybook tests and docs

* fixed spelling errors in docs

* Final round of edits for frontend, added backend folder architecture

* Created CODE_OF_CONDUCT.md

* Add code of conduct to contributing.md

* doc changes

* fixed broken links

* doc addition and changes

* introduce user guide & graphql api

docs/src/theme/icons.js

@@ -35,4 +35,7 @@ export {
   TbRocket,
   TbAugmentedReality,
   TbTerminal,
+  TbBrandGraphql,
+  TbApi,
+  TbUsers,
 } from "react-icons/tb";