Replacing Sans-Serif font with Times-New-Roman equivalent

[lucamuscat]

First of all, I would like that to thank you for the work that you put into this template.

I needed to change the font as I was finding the current one hard to read. I swapped it with the same font's Times-New-Roman counterpart by commenting out line 28 of um-fict.cls and replacing all instances of \sffamily with \rmfamily (this was needed to update the sections and subsections font).

Do you happen to know if these changes will cause any edge cases or bugs in the formatting? If not, I would appreciate if the repo's readme included the steps needed to exact these changes.