Add support for bootstrap dark mode

[abe-101]

Description

Bootstrap 5.3 now supports a dark mode out of the box
https://getbootstrap.com/docs/5.3/customize/color-modes/#dark-mode

in the docs they provide example js that can be used to toggle btw light and dark mode: https://getbootstrap.com/docs/5.3/customize/color-modes/#javascript

I propose adding this to the template
steps that need to be taking:

• add data-bs-theme="light" to base template
• add theme-toggler.js to static/js/ with this js code
• Source it in the base template
• add toggle buttons to the nav menu

I would argue that we should just add this but one could argue it should be added as a feature flag, what are your thoughts?

[browniebroke]

Sure, why not. I don't think it's worth the complexity of adding it as a template option and agree that "we should just add this" 👍🏻