Bump markdown-it version (allow multi-line inline math)

v0.8.0a4

Update __init__.py

Move to markdown-it-py parser

Implemented in #123

This release implements the move from mistletoe to markdown-it-py, as the underlying markdown parser. The reason for this is are discussed in executablebooks/meta#44 (comment) and executablebooks/meta#47, and the PR #123 discusses in more details the update.

Additional changes:

• Update pydata-sphinx-theme requirement
• Improve testing and move to GitHub Actions CI
• Add tests and fixes for reporter warnings and include directive
• Add documentation of sphinx parser options
• Apply doc fixes suggested by @rossbar in #121
• Add warning for non-consecutive headings

Bump markdown-it-py version

v0.8.0a3

Bump markdown-it-py version

Development Release of Move to markdown-it-py

v0.8.0a1

Update __init__.py

Minor update

v0.7.1

bump version

Update tokens position attribute

v0.7.0

Update tokens to use `mistletoe.Position` rather than old style tuples

Upgrade to mistletoe-ebp~=0.10.0

Introduces Footnotes and improves error reporting, etc (see commit for details)

Bump mistletoe version

v0.6.0a3

bump version

Bump mistletoe version

v0.6.0a2

bump version

Add footnote syntax

v0.6.0a1

bump version