[1.x] Fix reference URL not matching case sensitively

[limzykenneth]

Counterpart to #1421

[limzykenneth]

https://92b3ff0c-p5-js-website.p5js-org-account.workers.dev

[ksen0]

Documenting discord testing chat:

@nbogie :

The above is working on the PR preview for beta but not the preview for main.
E.g. the following won't work all lower-case:
https://92b3ff0c-p5-js-website.p5js-org-account.workers.dev/reference/p5/createvector/
https://92b3ff0c-p5-js-website.p5js-org-account.workers.dev/reference/p5.vector/fromangle/
https://92b3ff0c-p5-js-website.p5js-org-account.workers.dev/reference/p5.vector/fromangles/
https://92b3ff0c-p5-js-website.p5js-org-account.workers.dev/reference/p5/buildgeometry/
The equivalents URLs all work on the other preview (the one for beta).

@limzykenneth :

Yes that's expected, I haven't yet leave a comment in there mentioning it. I haven't dig into detail why that is the case, it may be some patch that wasn't applied to the main branch, but we are planning a 1.x > 2.x switch for the website soon which will center 2.x more so this is not a priority at the moment