Update gitignore
Merge branch 'master' of https://github.com/softcover/softcover
include full html in publish

* allow local book directory config file override
* version bump
Add MathJax to single-page output

[Delivers #60244750]
[#60244750]

* 60244750-mathjax-single-page:
  Add MathJax to single-page output
Merge branch 'master' into full-page
Merge branch 'full-page'