Text styling for more readable annotations

[cdharris]

Here's a little suggestion to make the external content more readable by increasing the font size, line height and padding.

I've also made it a Serif font to distinguish it from application content, feels to me a more 'readerly' look. We might want to choose a nice specific Serif font pairing rather than use a generic one, but there's lots more little tweaks yet to come I feel to make the reading experience a bit better (spacing and sizes), here's a little start since I wasn't happy with the default look when sharing.

Here's the look before:

And after:

Looks good? @blackforestboi @ShishKabab

[ShishKabab]

I'm not sure about the switch to a serif font (sans serif can be easier to read on a screen), but I like the removal of the spacing. Then again, when it comes to fonts, I'm not a designer.

What it does highlight though, is that lack of contrast between dark green and black/grey. I think this'd be good to fix.