Documentation Site Improvements - Version Selection Memory, Sorting, & Visibility

[Kaelten]

Is your feature request related to a problem? Please describe.

• When I change the version selection away from the default it will revert back to the default on new tabs and the like. This can lead me to looking at the wrong documentation on accident.
• The sorting puts the newest versions at the end of the list. Given the age involved and how long the list is this means the recent/default versions can be below the fold.
• When you scroll down on documentation pages the version (and search bar) scroll off the screen and you may not realize you're looking at the wrong version.

Describe the solution you'd like

• Version selection is persisted across sessions and tabs. This could reset on some sort of mechanism whether that was just a decent timeout or something like a recommended version change is a thought exercise for the reader.
• Sort so the newest versions appear at the top of the version selector. Consider taking ancient versions and hiding them under a "more versions" popout or similar.
• Make the version selection/search bar sticky so it will pin to the top of the screen while you're scrolling.