feat: Add Profile button and navigation route

[pujaux]

Related Issue

Closes #928

Summary

This pull request introduces a new "Profile" page to the application. It includes a navigation button in the header and the necessary server-side routing to handle requests to the new page.

Changes Made

UI: Added a "Profile" button to the main dashboard header to improve user navigation.

Routing: Implemented a new app.get('/profile', ...) route in server.js to serve the profile.html file.

File Addition: Created public/profile.html to display user profile information.

Testing

Verification: Confirmed that clicking the "Profile" button correctly navigates to the /profile route.

Server: Tested locally to ensure the server correctly identifies the route and serves the static HTML file without 404 errors.

Screenshots

Before:

After:

-"My Profile" heading, confirming the page successfully loaded.

-"This is your profile page!" text, confirming the HTML content is rendering correctly.

-"Back to Dashboard" link, confirming the user has a way to navigate back.

Checklist

• Code follows project style
• Tested locally
• No unrelated changes included
• Documentation updated (if applicable)