Augment links to the next and previous page

[lucc]

HTML allows links to be marked with rel="next" and rel="prev" and some browsers support shortcuts to activate these links: https://www.w3schools.com/tags/att_a_rel.asp

Can you please add these attributes to the links at the bottom of each page. I tried to look at the vuepress config but am unfamiliar with vuepress and could not quickly figure out how to do it.

[Jhnbrn90]

I've also done some research and it seems that this is currently not supported by VuePress. However, if it appears possible to do with VuePress I welcome a PR of course.