Notebook URLs should be case-insensitive

[ccerv1]

This works:
https://www.oso.xyz/optimism/Retro-Funding-Devtooling-Results

This 404s:

https://www.oso.xyz/optimism/Retro-Funding-Devtooling-results

[linear[bot]]

OSO-1272

[ryscheng]

In my opinion, we should leave the default casing in the database (like GitHub does). GitHub will actually properly load with incorrect casing

In other words, if you explicitly use a certain combination of upper/lower case (because you like camel case or something),
the links on your dashboard preserve that casing.

But then if you navigate to a different set of casing, it'll load correctly
For example
https://github.com/opensource-observer/OSO
https://github.com/opensource-observer/OSo