Add "page" type for stand-alone (unlisted) subpages

[gammaw]

Issue: post or pub types cannot be used for something like /privacy

There is one for privacy yes, but it's one + the route cannot be edited.

Quick fix: make existing policy page URL editable.

[revnandi]

the ssg builds pages from page files in the repo (ie privacy-policy.astro -> /privacy-policy) or dynamically from a template based on data from a collection endpoint from strapi

to be able to add pages from the cms with custom urls I need to create a page collection, change the menu so it supports dynamic data etc...

for now I just changed the privacy page filename

[gammaw]

@revnandi thanks! let's close it for now, cause I'm not sure if we need extra pages atm.