Dark mode: Progress bars

[louismaximepiton]

Description

Progress bars in dark mode, by using existing Sass vars :

Sass var	Previous value	New value
$progress-bg	var(--#{$prefix}secondary-bg)	var(--#{$prefix}active-bg)
$progress-bar-color	$black	var(--#{$prefix}highlight-color)
$progress-bar-bg	$primary	var(--#{$prefix}link-hover-color)

⚠️ Need a check on all colors of this progress before going to review.
⚠️ Not quite sure to use the right variables here.

Links

• https://deploy-preview-2326--boosted.netlify.app/docs/5.3/components/progress
• https://deploy-preview-2326--boosted.netlify.app/docs/5.3/dark-mode/#progress

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[julien-deramond]

The badges in the Orange navbar are written in white, shouldn't it be the same here in light mode?

[julien-deramond]

Based on the elements we have currently, I'm fine with the content of this PR. However I'll add the remaining questions to tackle in the main PR description.