Piccolo-theme

Added ``z-index`` for the left sidebar on mobile.

Fixes to support Sphinx 7.2. Thanks to alexlancaster for reporting this.

Bundling the Roboto Mono bold-italic font with the theme, as it's used in some code blocks. Thanks to noxpardalis for adding this.

The custom fonts are now bundled with the theme. Thanks to noxpardalis for this.

What's Changed
* Add/tests by mikebarr24 in https://github.com/piccolo-orm/piccolo_theme/pull/40
* update requirements by dantownsend in https://github.com/piccolo-orm/piccolo_theme/pull/45
* Fix html errors by mblaschke in https://github.com/piccolo-orm/piccolo_theme/pull/46
* change colour used for emphasis in code blocks by dantownsend in https://github.com/piccolo-orm/piccolo_theme/pull/49

New Contributors
* mikebarr24 made their first contribution in https://github.com/piccolo-orm/piccolo_theme/pull/40
* mblaschke made their first contribution in https://github.com/piccolo-orm/piccolo_theme/pull/46

**Full Changelog**: https://github.com/piccolo-orm/piccolo_theme/compare/0.14.0...0.15.0

When switching to dark mode, we automatically apply our own custom dark mode styles to code blocks.

This gives a great experience out of the box. However, if someone uses their own Pygments theme, they might want to use that theme in both light mode, and dark mode. They can now do so, using the `dark_mode_code_blocks` option.

python
conf.py

html_theme_options = {
"dark_mode_code_blocks": False
}