Implement 404 page and lowercase route redirection

[theNatePi]

Currently, there is no 404 Not Found page in the website.

Visiting invalid or mistyped URLs such as /recruitment displays only the default 404, even though /Recruitment exists and should be routed.

Feature requirements:

• Create a 404 Not Found page.
• Implement automatic redirection for routes entered in all-lowercase (e.g., /recruitment) to their canonical mixed-case equivalents (e.g., /Recruitment).