Upgrade to Bootstrap 5.3+

[keunes]

Short description: Upgrade Bootstrap to version 5.3 or later, when it is released.

Location:

Why have this: It 'natively' supports Dark mode 🎉 This will decrease the need for custom CSS. And it will undoubtedly bring other improvements as well.

More info:
twbs/bootstrap#35857 (comment)

[ByteHamster]

Also, building now gives these warning messages because of the outdated bootstrap:

Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($spacer, 2) or calc($spacer / 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

    ╷
717 │ $navbar-padding-y:                  $spacer / 2 !default;
    │                                     ^^^^^^^^^^^
    ╵
    .../antennapod.github.io/_sass/bootstrap/_variables.scss 717:37  @import
    bootstrap/bootstrap.scss 9:9                                                               @import
    .../antennapod.github.io/assets/css/main.scss 4:9                root stylesheet

[Rotzbua]

Another advantage is the removal of jQuery dependency. For custom code this can be done upfront.
Reference: https://getbootstrap.com/docs/5.3/migration/#dependencies

[keunes]

Hi @Rotzbua,
With #203 done, are we ready to start working on this? (If yes, I'm wondering how to approach this. Maybe we should see if we can drop more custom CSS? Also, would you be up for a call to discuss the site/this upgrade in person?)

[keunes]

Hi @Rotzbua, kind reminder. Are you interested in working in this? I would love to work on this and get this done :-) (if no time or interest, please don't hesitate to mention that also)

[Rotzbua]

@keunes I will have a look around Christmas and new year