fix username redirection on mWeb

[PiyushChandra17]

Fixes #2717

Changes:

• Replaced h5 with <Link />
• It will redirect to project.owner.username/sketches

https://github.com/processing/p5.js-web-editor/assets/47579287/2788d537-4ccc-4294-aba5-a4811b2fc7cd

I have verified that this pull request:

• [x] has no linting errors (npm run lint)
• [x] has no test errors (npm run test)
• [x] is from a uniquely-named feature branch and is up to date with the develop branch.
• [x] is descriptively named and links to an issue number, i.e. Fixes #123

[PiyushChandra17]

@lindapaiste Can you please review this PR? If everything seems fine, then let's merge this. Thanks!