Updates the tutorial in "Writing help center articles: Writing
style" for using `<kbd>` HTML elements when documenting keyboard
shortcuts in help center articles.
Also, adds section about the keyboard tip macro/syntax.
Creates `zerver.lib.url_redirects.py` to record old and new URLs
for documentation pages that have been renamed/moved and need URL
redirects.
This file is then used by `zproject.urls.py` to redirect links and
by `zerver.test.test_urls.py` to test that all of the old URLs
return a success response with a common page header/text depending
on the type of redirect (help center, policy, or API).
Adds a section to contributor docs on writing documentation for
how to use this redirect system when renaming a help center or api
documentation page.
Fixes#21946. Fixes#17897.
Adds a section for writing and style guidlines to the tutorial
for writing help center articles. Moves the sections on 'Voice'
and 'User interface' to be in the new section, and adds a section
on 'Keyboard shortcuts'.
Renames `/docs/documentation/user.md` to reflect the rebranding
from "user documentation" to "help center documentation".
Also, fixes any linking in the docs to that file.
Lauryn Menard
Anders Kaseorg
Lauryn Menard