Consider swapping /:fileId for a blank page with an og:video/og:image tag and redirect

[nbitzz]

I'm pretty sure literally anyone can verify monofile on like google search console for themselves rn lmao
If we do #50, we can probably save ourselves from breaking anything by just checking the date at which a file was uploaded
People are kinda used to /:fileId being a direct link, however (or at least I am), so I'm not sure; but for the stuff most people use /:fileId for this is also kind of an improvement?

I'm not sure if we should do this or not so