Improve readability, fonts more like metacpan

[gilmagno]

Hi. What do you think about these small changes in the CSS?

They render fonts more like metacpan:

• font-color: #333: a bit blacker
• font-size: 1em: a bit larger. And we'd have less chars per line. Currently for me it renders ~135 chars per line. Compare with https://metacpan.org/pod/Catalyst (~115 chars per line). https://docs.python.org/3/tutorial/introduction.html (~105 chars per line)
• remove 'Courier' from the pre/code fonts: at least in Firefox (Debian), it renders very thin

[gilmagno]

Correction: metacpan chars-per-line is more than I wrote. It's only ~115 when the "Contents" panel on the right is open. Anyway, the point still holds: we could have less than ~135 chars per line, with the font being a bit larger and blacker.

Thanks!

[Grinnz]

I've used some of this feedback in https://github.com/Grinnz/perldoc-browser/commit/76dd3b14dcffb243baeeec4221b57dbd0476a712. I feel the text size change is a bit drastic - users have plenty of options to adjust their own text size. Thanks for the suggestions!

[gilmagno]

You're welcome :) And thanks for the improvement