Document how to change font size in Tabnine Chat

[seanrmurphy]

Is your feature request related to a problem? Please describe.
I don't know how (nor even if it's possible) to modify the font size in Tabnine Chat.

Describe the solution you'd like
Ctrl-+ would work.

Describe alternatives you've considered
None.

Additional context
Sometimes I work on the laptop and it would be nice to be able to scale the font size. I do use i3wm, but I don't think that should be a big issue; almost all apps support such scaling in i3 with simple keystrokes.

Also, I'm not really sure where to put this - it didn't look like the main tabnine repo was the right place but I didn't know where to put an issue with tabnine chat. Also, this does feel a bit more like a forum question 'how can I do this" than a github issue, but I could not find any such forum.

[srayleighdk]

if need you can change font-size in /chat/index.html. Need css knowledge. sorry my english bad