Rename Sodium repository on GitHub

[jellysquid3]

We're no longer just a Fabric mod. Let's update the name. But this may have some consequences. Links to the repository/etc from the mod need to be updated.

[Gaming32]

I will note that GitHub will automatically set up redirects, so not every link needs to be updated immediately.

[TheNukeLore]

Would the name just shorten down to "sodium"? Or would alternatives be considered such as "sodium-renderer"

[Ecorous]

I would suggest either sodium-mod or sodium. And yeah, github redirects should sort you out for a good while