docs: make ZenStack vs. Other Tools separate pages for SEO

[rortan134]

make each comparison in ZenStack vs. Other Tools separate pages so they can rank for SEO and make a few extra bullet points (e.g. pros and cons) for each :)

[ymc9]

make each comparison in ZenStack vs. Other Tools separate pages so they can rank for SEO and make a few extra bullet points (e.g. pros and cons) for each :)

Thanks! Yes, makes very good sense!