A new hotkey, lowercase `z` (for `zoom`) has been implemented to allow
the user to go to the near view of the selected message with 1 keypress.
Documentation has been added for this both in the help center, and the
in-app `Keyboard shortcuts` menu.
The effect is identical to clicking on a message's timestamp, which
links to that message's near view.
Fixes: #24227.
These files are not Jinja2 templates, so there's no reason that they needed
to be inside `templates/zerver`. Moving them to the top level reflects their
importance and also makes it feel nicer to work on editing the help center content,
without it being unnecessary buried deep in the codebase.
N-Shar-ma
Lauryn Menard