Update nav.php to use relative path hyperlinks

[akbaig]

This pull request removes the dependency of placing the project at the root level of a website.

1. Nav.php uses relative path for the hyperlinks
2. Hyperlink paths are adjusted dynamically (depending upon where the module is called from, /index.php or logs/index.php)

Example:

www.website.com/something/index.php ✅ (Relative hyperlinks still work in this case)

[akbaig]

@MichaelBelgium any thoughts on this?

Sorry, I didn't mean to close this PR. It was a side-effect of me deleting the fork.

[MichaelBelgium]

You might want to do a new PR then cuz if your fork is gone, i cant see the changes and test it out

[MichaelBelgium]

Or well, I can copy the changes cuz they're still visible here

[akbaig]

Please see #58. I've replicated this PR there.