Added

• Showcase for multiple lines with contours in TikZ overlay (ae4ad39)
• Hint for the glossaries-extra Beginner's Guide (d8b7fb4)
• Written permission (license) to use and distribute the Fontin Sans
  font (cf79ee4)
• Summary for font licenses (0372475)
• Contributing guideline (56c4eac)
• README info on git and Docker (fa228b7)
• A matlab2tikz exported plot example (86dac19, c3e9b09)
• YAML-based configs for pandoc (cb39706)
• Proper check for the used TeX engine (de2a293)

Changed

• Fontawesome implementation, away from the fontawesome package to the more
  modern fontawesome5 (8df784e)
• Insertion of git metadata into the document (PDF metadata or into the printed text
  directly): now based on Lua (6d0cd7e)
• Also adjusted the README according to the new Lua implementation (ed946b8)