Use localStorage for pageCache

[RogerDodger]

A GET to a certain url should return a consistent result. Currently, paged threads without an explicit page go to the page it thinks the user was at last.

This mechanism is achieved by the server storing the page the user was last at in a cache.

Instead of the server making this decision, the user should do it themselves with localStorage and link hijacking of clicked links.

Alternatively, disable page caching altogether.