6.0.0

Breaking Changes

Docker image: removed deprecated automatic activation of --mathjax. Pass '--math mathjax' to continue using mathjax, or '--math' to use KaTeX (see below).
RACK_ENV is ignored, please use APP_ENV instead (@svoop).

New features

Add support for Mermaid diagrams (@dometto).
Add support for downloading page sources with ?raw (@tstein).
Add openssh client to docker images for ssh: repo support. (@jagerkin).
Add support for mathematical typesetting using KaTeX (@dometto). Users can now choose between MathJax and KaTeX with the --math flag.
Add support for more languages (Chinese).

Fixes & Improvements

Fix (Docker image): add git configuration for /wiki as safe directory. #2006
Fix: use base_path as set in config file.