Make navbar sticky and fix 'Check Trends' button functionality

[Shrey0610]

Description

Summary of Changes:

I made the navbar sticky to improve accessibility as users scroll through the page. I also fixed the "Check Trends" button so that it now scrolls smoothly to the "Repo Controls" section when clicked.

Fixes #81

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

Screenshots (if applicable):

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Name	Status	Preview	Comments	Updated (UTC)
trendtrack	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2024 3:56pm