Added responsive navbar with mobile menu

[vaishnavidark4-tech]

Added a responsive navigation bar for DevTrack.

Features Added
Sticky navbar
Navigation links
Responsive mobile hamburger menu
Sign In button
Improved navigation structure

[vercel]

@vaishnavidark4-tech is attempting to deploy a commit to the PRIYANSHU DOSHI's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[github-actions]

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[Priyanshu-byte-coder]

Hi! Your PR has merge conflicts with the current main branch. Please rebase your branch on latest main and resolve the conflicts:

git fetch upstream
git rebase upstream/main
# resolve any conflicts
git push --force-with-lease origin your-branch

Once resolved, we'll merge it in. Thanks!

[Priyanshu-byte-coder]

This PR now has merge conflicts with main due to recent merges. Please rebase onto the latest main branch and resolve all conflicts to proceed with merging.

[Priyanshu-byte-coder]

This PR has merge conflicts with main. Please rebase your branch against the latest main and force-push to resolve. Run: git fetch upstream && git rebase upstream/main

[Priyanshu-byte-coder]

This PR has merge conflicts with the current main branch. Please rebase your branch onto main, resolve the conflicts, and force-push. Once conflicts are resolved and the PR is marked as mergeable it will be reviewed for merging.

[vaishnavidark4-tech]

Hi, I've rebased my branch on the latest main, resolved the conflicts, and force-pushed the updated branch. The workflows appear to be awaiting maintainer approval. Please let me know if any further changes are needed. Thank you!