[FEAT] Add navigation bar

[sayna24bey10080-gif]

Closes #456

Description :-

Added a responsive navigation bar to improve user navigation and accessibility across the website.

Changes Made :-

Created a Navbar , which consist of :-

• DevTrack logo and branding on the top-left corner
• Home button
• Dashboard section
• Features section
• Goals section
• Profile section
• GitHub Sign-In option

Below is a screenshot of the current navbar design:

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[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]

PR is conflicting with main (likely due to layout.tsx change from the recently merged footer PR #580). Please rebase:

git fetch upstream
git rebase upstream/main
git push --force-with-lease

[sayna24bey10080-gif]

Resolved the merge conflicts and updated the branch with the latest changes from main. Please review the PR again. Thank you!