TSK: Improve frontpage design and user experience

[atyrode]

For the design:

• [ ] something that is aesthetically pleasing, can't really be defined, it's a process of refining

For the user experience:

• [ ] copy the link just generated in the clipboard
• [ ] better mobile phone responsiveness
• [ ] less particles, it gets laggy on some phones
• [ ] display errors in the frontpage if relevant