Manage a pathway registry review

[Zethson]

• [x] Inconsistent style with the celltype registry one. More verbose and just different. Will harmonize both (meet somewhere in the middle)
• [x] Doesn't render nicely in the sidebar
• [x] This is just noise here. We have other datasets that had more preprocessing before we use them as examples.
• [x] "This analysis is based on: https://gseapy.readthedocs.io/en/master/singlecell_usecase.html" -> Could render as a link or be hidden or something
• [ ] IDs.L -> missing space