Add PageBundles as option

[mattstratton]

some thoughts on how to make it parameterized:

https://github.com/chipzoller/hugo-clarity/blob/master/exampleSite/content/post/bundle/index.md

[mattstratton]

I quite like having an option per page/episode/whatnot that lets you opt into it, like a setting usePageBundles

if a user wants that to be the default they could just override the archetype to make that set to "true"