add pictures, figures and diagrams from papers to the bot response.

[metya]

In the papers, there are various figures and diagrams and so on. It's often beneficial to look at them to understand what the paper is about.
So the feature is to add these pictures to the response of the bot in the window of the bot.

• разобраться с кодом
• разобраться с парсером пдф
• впилить картинки