I'd like to put a unicode char to the immediate right of the Numbat favicon in the browser tab

[davidtew]

I'm a visual person. For me it would be great if I could have a unicode character to the right hand side of the numbat favicon rather than "Livebook" as is written now. When I have several livebook tabs open plus other tabs, the tab width gets narrow. At this point I only know the tab is a Livebook file but I can't tell which one without hovering over the browser tab.

With this (simple?) change, I would see a picturegram (unicode emoji, for example) in each browser tabs thus recognise each file at a glance.

Obviously, in this scenario I would have to have a unicode character as the first character in the title. That's fine by me.

[jonatanklosko]

@josevalim should we flip the title to {title} - Livebook?

[josevalim]

Sounds good to me!

[davidtew]

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