pprofiles/workstation: Use true type VGA font

The DOSEMU fonts we were using so far for CP437 were bitmap fonts only
and with no unicode support.

Luckily there is https://int10h.org/oldschool-pc-fonts/ - which is a
really cool font pack containing all the cool oldschool fonts that I
remember from my childhood and still use today for creating ASCII art.

Since we recently* hit the 21st century, I think it's about time that
even I should start having terminals with proper Unicode support. The
latter is already the case, but the glyphs just didn't display
correctly.

The font that I switched to (MxPlus IBM VGA 8x16) is using embededd
bitmaps, so I also enabled useEmbeddedBitmaps option, so that the font
still looks as crisp as the old DOSEMU font.

To make sure it really is the same font, I compared screenshots of all
the CP437 characters with the new font and they match the old font 1:1.

I also removed the liberation_ttf font, since it's already included by
the default NixOS font configuration.

* -> Your mileage may vary, but hey, the 90ies were yesterday, right?

Signed-off-by: aszlig <aszlig@nix.build>

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