fix: progression sidebar active color

[sijan2]

Description

Changed the active color of navbar items in the "Learn" section of the docs for better contrast and clarity. The previous color made it difficult to determine the selected navbar item.

Validation

Check List

• [x] I have read the Contributing Guidelines and made commit messages that follow the guideline.
• [x] I have run npx turbo format to ensure the code follows the style guide.
• [x] I have run npx turbo test to check if all tests are passing.
• [x] I have run npx turbo build to check if the website builds without errors.
• [x] I've covered new added functionality with unit tests if necessary.

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Name	Status	Preview	Updated (UTC)
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[ovflowd]

Hey there 🧇 I'm only worried about the contrast of those colours. I actually think instead of changing the colour you should make the text bold. That would actually be way better IMO

[AugustinMauroy]

+1 for Claudio proposal