feat: Import data from CSV

[erwanMarmelab]

Problem

We can't import data from CSV in the onboarding page.

Solution

• Add an "Import data" button in the onboarding page
• Remove the "Import CSV" button for contacts
• Fit the styles for the "Add note" and the "Add contact" buttons
• Add the new "Import data" button on every resources

Additional Checks

• The documentation is up to date
• Tested with fakerest provider (see related documentation)
• Tested with Mobile resolution

Also, please make sure to read the contributing guidelines.