Introduce shortcuts for text formatting

User story: I often use short-cuts to format text and that’s not supported
Strg + B = bold
Strg + I = italic
Strg + U = underline
Alt + Shift + 5 or Strg + Alt + 5 = strikethrough (i see different versions)

And once I’m here. Now I notice that the question mark doesn’t go anywhere (well, I see the url, but I can’t click it)

Complexity: I suppose rather low

Outcomes (or what needs to be done to move forward):
It could be implemented right away. Seems like a bit specific request, but I want to get more used with this board so here we go!