Better on-boarding experience

[nellihol]

All stakeholders commented that the information page is too much text.

We should have a simpler stack of instructions with animated examples how to do the verification and classification tasks, and only some examples of the keyboard shortcuts. All the shortcuts should be available when clicking the info-button.

Todo:

• [ ] Decide what instructions to keep, how to word them
• [ ] Get animations or short videos on the showcased tasks: https://github.com/ecoacoustics/web-components/issues/108
• [ ] have separate "onboarding" and "info (or help)" pages
• [ ] Only show on-boarding once per user (save state?)
• [ ] Choose 3 keyboard shortcuts to showcase and move rest to help page
• [ ] https://github.com/ecoacoustics/web-components/issues/107

(I tried to find an issue for this, sorry if this is a duplicate!)

[atruskie]

Mostly in #107 but this can serve as a tracking issue.