Eisvogel (Version 2.3.0)

Note
The Eisvogel template is now available in the Docker image pandoc/extra!
For more information, refer to the documentation in the Readme or the documentation on docker hub.

• Merge changes from the pandoc default LaTeX template (as of 2023-03-10, 9b04036).
  • Add CJKsansfont and CJKmonofont for XeLaTeX. CJKsansfont and CJKmonofont will be set
    for XeLaTeX only if CJKmainfont is also provided (#328, Yudong Jin).
• Add documentation in the README on how to use the pandoc/extra docker image (#319, damien clochard).
• Fix wrong literate of characters è and È in listings. The character è was wrongly
  converted to é and È to É (#324, damien clochard).