Fix position of source code pages sidebar

[GuillaumeGomez]

Fixes #2093.

I couldn't find where those rules were actually used. I tested a lot of crates but none of them used it. I suppose it was to fix a docs.rs bug we had at some point.

[syphar]

@Nemo157 can you help with the review since it's frontend code? Otherwise I'll just test it as far as I can, and then merge :)

[GuillaumeGomez]

The important thing to check is that it doesn't break for crates before and after the date of the CSS file. I used sysinfo as base for that since there are a lot of versions across time.

[GuillaumeGomez]

Considering this is a bug fix, can we take a look in the next days please? We can do a call to have live explanations if you prefer.

[syphar]

Considering this is a bug fix, can we take a look in the next days please? We can do a call to have live explanations if you prefer.

I was hoping for some frontend help, but you're right in reminding me here.

I'll go the manual testing approach, if it works and fixes the issue, I'll approve.

[syphar]

I was able to reproduce the bug,
and that the fix resolves it.

Also, thank you for adding the test :)

[GuillaumeGomez]

Thanks for the review!