Esparto

- Fixes
- Fix bug preventing some Matplotlib figures from being converted to SVG and HTML [(127)](https://github.com/domvwt/esparto/issues/127)

- Page Style
- Replace footer with icon buttons
- Esparto home
- Share document (for compatible systems)
- Print page
- Add CSS style for icon buttons
- Prefer fully specified fonts to system fonts
- Remove underline from URLs

- New Features
- Command line tools for printing default Jinja and CSS files
- Fixes
- Config YAML now read with safe loader
- Deprecations
- Removed CDN theme links
- Dependencies
- Image content now supported without PIL

- Fixes
- Set minimum page height to fill device screen
- Read page additional output options when publishing HTML and PDF

- Fixes
- Remove call to `fig.tight_layout()` when converting Matplotlib figure to SVG for PDF

- API
- Page now accepts `max_width` and `output_options` arguments
- Content classes no longer accept `width` or `height` arguments
- New Features
- Output rendering options can now be configured at page level
- Additional markdown features recognised
- Fixes
- JavaScript is now placed at end of page so HTML is loaded first
- Page Style
- Removed unnecessary indentation
- Tables now render in minimal, clean style
- Improvements to sizing and centring of plots
- Cleaned up unnecessary HTML and CSS
- Majority of CSS attributes moved to `esparto.css`
- Dependencies
- Pillow is now optional
- BeautifulSoup4 is now required
- Upper version limits removed from all
- Other
- Type hints implemented with ~100% coverage