Improving FEDOT documentation

[nicl-nno]

1. Modify quick start guide: add step-by-step explanations of typical FEDOT scenaries.
2. Add doc devoted to installation issues.
3. Add instruction to the FEDOT's bug reporting.
4. Extend Q&A sections with typical questions from chat

Subtasks:

• [x] https://github.com/nccr-itmo/FEDOT/issues/878
• [x] https://github.com/nccr-itmo/FEDOT/issues/879
• [x] https://github.com/nccr-itmo/FEDOT/issues/880
• [ ] https://github.com/nccr-itmo/FEDOT/issues/881
• [x] https://github.com/nccr-itmo/FEDOT/issues/882
• [x] https://github.com/nccr-itmo/FEDOT/issues/883
• [x] https://github.com/nccr-itmo/FEDOT/issues/884
• [x] https://github.com/nccr-itmo/FEDOT/issues/885
• [x] https://github.com/nccr-itmo/FEDOT/issues/886
• [x] https://github.com/nccr-itmo/FEDOT/issues/887
• [x] https://github.com/nccr-itmo/FEDOT/issues/888
• [x] https://github.com/nccr-itmo/FEDOT/issues/889
• [ ] https://github.com/nccr-itmo/FEDOT/issues/890
• [ ] https://github.com/aimclub/FEDOT/issues/1071

[nicl-nno]

This ideas can be useful:

https://github.com/nccr-itmo/FEDOT/issues/177

[nicl-nno]

As well as this:

https://github.com/nccr-itmo/FEDOT/issues/219

[nicl-nno]

Пока рано наверное закрывать: в документации много страниц-заглушек, которые надо дорабатывать.