[TODO] Implement real 404 page

[rpaladin]

Currently if a invalid website URL is inserted into a browser's address bar, the website will automatically redirect to the home page.
While this process is sufficient, it does not reset the URL address on home redirect.

EXAMPLE

Before

https://upbge.org/#/abc

After

Notice the address remains as previous even after redirect.

Conclusion

• The URL address should either be reset after redirect.
• OR the redirect should be the address of a working 404 page.
e.g.