feat(TMR-2557): add WhatsApp share button and update pre-populated text

[ivaylogp]

Description

Changed the pre-populated text when sharing an article Added WhatsApp share button on mobile devices

TMR-2557

Checklist

• [ ] Have you done any manual testing?
• [ ] Does it have automated tests?
• [ ] Do you need any other PRs merged before this (if so please list)?
• [ ] Do you need to update the README/Runbook
• [ ] Have you checked for accessibility?

Screenshots (if appropriate):

Include screenshots if needed.