Remove profile URL workaround

[showalter]

usnistgov/oscal-content#59 has been resolved, so this bit of code that fixes content URLs is no longer needed.

This can be tested by loading https://raw.githubusercontent.com/usnistgov/oscal-content/main/nist.gov/SP800-53/rev4/json/NIST_SP-800-53_rev4_MODERATE-baseline_profile.json into the profile viewer

Closes #502

[kylelaker]

Thank you, @showalter!

Fun fact: you can actually link directly into the viewer by using the ?url query string; for example https://oscal-viewer.msd.easydynamics.com/profile?url=https://raw.githubusercontent.com/usnistgov/oscal-content/main/nist.gov/SP800-53/rev4/json/NIST_SP-800-53_rev4_MODERATE-baseline_profile.json

Another fun fact: I actually think our TODO here was a little misleading. The linked issue on the oscal-content repo actually had nothing to do with this. That issue is actually for the fixJsonUrls() function (and #158). But somewhere through layers of redirection, copying and pasting, and misunderstandings we attributed this to the wrong upstream issue. Basically, at one point, NIST moved the content up a level in the oscal-content repo but it took some time for the actual published files to update and that's what this workaround was for. I've gone ahead and marked #158 as a good first issue and a chore.

I also forgot to write up that ticket about our mistake in our PR triage workflow, so don't mind the impending "PR Triage" workflow failure (that's to both @showalter and to the internal team). In the interim, I will manually kick off a review request.