Home page (#59)

* Add hero to home page

* add preview mode

* time is expressed in local time zone

* Convert time to UTC in data/

* add feature list to home page

* add content to home

* Apply suggestions from code review

Co-authored-by: Anes Belfodil <abelfodil@users.noreply.github.com>

* Each section has a <section> tag && add team images

* Change logo && make iframe responsive && create sleep_stage_section

* resize iframe && place button down another when overflow

* change app logo

* replace woman sleeping by dodo and makes tabs card's size fix

* Rework features section layout

* Add Hardware section

* Remove some guide assets

* update tabs content && fixed titles

* extract a common preview button

* Reorder section && add text to preview mode Call to action

* Add call to action section

* Change and fix icons to font_awesome

* oupsy doupsy

* Cange content tech section

* Fix image resizing

* Apply suggestions from code review

Co-authored-by: Anes Belfodil <abelfodil@users.noreply.github.com>

* text correction

Co-authored-by: Anes Belfodil <abelfodil@users.noreply.github.com>

Author: William Harvey

web/package.json

@@ -23,8 +23,7 @@
     "not op_mini all"
   ],
   "dependencies": {
-    "@material-ui/core": "^4.11.0",
-    "@material-ui/icons": "^4.9.1",
+    "@fortawesome/fontawesome-free": "^5.15.1",
     "@octokit/rest": "^18.0.6",
     "axios": "^0.19.0",
     "axios-observable": "^1.1.3",