change link to epimodelac tutorial on disease X

Posit announced at https://posit.co/blog/migrating-connect-cloud-posits-unified-publishing-solution about Rpubs that:

> Your existing documents will stay at their current URLs until December 31, 2031. Links you've already shared will keep working through that period, giving you plenty of time to republish anything you want to keep to Connect Cloud.

The link may change after the given deadline.

Problem:

- We link to one Rpubs tutorial at https://github.com/search?q=org%3Aepiverse-trace%20tracelac%2FdiseaseX&type=code
- Context: https://epiverse-trace.github.io/tutorials-middle/delays-functions.html#how-to-estimate-delay-distributions-for-disease-x
- We have it saved in Spanish at https://epiverse-trace.github.io/epimodelac/EnfermedadX.html
- But the original is in English at https://rpubs.com/tracelac/diseaseX

Solution:

- link to new version after solving https://github.com/epiverse-trace/epimodelac-en/issues/9
- Or, assess migration from https://rpubs.com/tracelac/ to Connect Cloud, get the latest link, and update the corresponding sections.