Further screenshot updates

[sivaraam]

With the release of the new UI in v3.0 of the app, the UI has changed significantly. Some screenshots have been changed to reflect this. Still a few more things could be improved,

1. The "View your contributions and ongoing campaigns" needs to be updated still
2. We could include screenshot of other new features and existing features which need more attention like peer review.
3. Anything else?

[Ankur0710]

I want to contribute to this project , if yes please completely guide me on this , i am a beginner on this please reply as soon as possible

[prototyperspective]

Would be good to also screenshots of the Leaderboards / Achievement pages to the Features since that is interesting and as of now not even possible on desktop.