Danny/kernel 285 docs sidebar headers blend in with normal content titles

[dprevoznik]

Description

Adds style.css file to style the sidebar titles in the docs, so they are larger and stand out more.

Implementation Checklist

• [N/A] If updating our sample apps, update the info in our Quickstart
• [N/A] If updating our CLI, update the info in our CLI

Testing

• mintlify dev works (see installation here)

Docs

• [N/A] Link to a PR in our docs repo documenting your change (if applicable)

Visual Proof

Please provide a screenshot or video demonstrating that your changes work locally:

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TL;DR

Made docs sidebar headers larger and bolder to distinguish them from content links.

Why we made these changes

The previous styling for sidebar navigation headers was too similar to regular page links, making the documentation's structure difficult to scan. This change improves navigation clarity and readability.

What changed?

• Added a style.css file to introduce custom styles for the documentation.
• Targeted sidebar group headers to increase their font size and weight, making them stand out.

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