Also create dedicated channels and topics sections in sidebar.
Makes 'start a new topic', a section in introduction to topics
page.
Co-authored-by: Prakhar Pratyush <prakhar@zulip.com>
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.
Prakhar Pratyush
Alya Abbott
David Rosa
Lauryn Menard