Ability to Favorite some pages on a Space.

[JFQueralt]

Problem:
We have found ourselves having to navigate through a Space's structure (pages, subpages) when editing information that is being currently worked on for a given period of time. At times that's a lot of clicks, especially when there's a substantial amount of nesting.

Proposed solution:
It could make sense to have a Favorite/Starred section that is easily to access at the root of the Space.
A simple Star icon acting like radio button (on/off) could be a simple way to add this to the interface of a page.