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Add CI configuration

See merge request !5

Math and Beamer fixes

See merge request !8

Don't define weight macros for Roboto

See merge request !7

The roboto package provides these itself since the 2019-04-05 version.

- Restore the thin/light/medium font families
- Add thin/light/medium univers aliases
- Fix the Math fonts

Remove bundled Roboto in favour of roboto package

Closes #3

See merge request !4

Closes #3

Always use Roboto for Greek letters.

See merge request !3

LinotypeUnivers only offers three greek letters (Delta Omega and pi).
Missing greek letters are replaced by default latex mathfont causing
ugly discrepencies.

Preferential to use Roboto for the Greek symbols.

- Rename setter commands
- Reformat some code
- Make outline configurable
- Minor improvement to footer

- Remove commented code
- Change some tabs to spaces
- Change the descriptions of the fonts package

Added three new front page backgrounds

See merge request !1