feat: add bold and italic buttons to editor

[victordelva]

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[patak-dev]

This looks good on big screens, but I'm afraid we are already out of space for mobile. @userquin also was working on some advanced features that would require space. And we got a request to hide the code block button. I think we should already have these two new ones and the code block behind a new format button that opens a toolbar on hover maybe?

[victordelva]

@patak-dev
I'll try to work on that

[victordelva]

I used a dropdown. this is how it looks on smaller screens.
What do you think @patak-dev ?

[patak-dev]

It looks like there is a glitch in mobile, the keyboard collapses when the new button is pressed. Maybe is normal but we coupd check if that could be avoided

[boehs]

I think a simple e.preventDefault fixes

[boehs]

closes #1401