Add more Cucumber scenarios and improve Cypress config

[x] Unit tests: npm run utest-cover and check coverage
[x] Functional tests: npm run dev-front and npm run ftest
[x] Run App: npm run build and npm run dev-start -> check that no errors/warnings appear in browser console
[x] Run App: with Chrome Devtools Mobile Device Screen
[x] Upgrade version
[x] Update to last version of chemistry-ui
[ ] Deploy in Heroku before merging in case of potential breaking changes

Fixes #98

W01fw00d / cooking-with-amateurs