feat : Add link sharing for specific lesson steps in mobile app for discord assistance #1295

[Herve176]

Checklist:

• [x] I have read and followed the contribution guidelines.
• [x] I have read and followed the how to open a pull request guide.
• [x] My pull request targets the main branch of the repo.
• [x] I have tested these changes locally on my machine.

Closes #1295