Extends the linking to Zulip documentation to cover:
- Getting URLs to messages via the message timestamp.
- Getting links to topics via the three-dots menu.
- Getting links to streams via right-click context menu.
Creates a new tabbed section for using the browser
address bar to copy URLs.
Adds a section about the Markdown feature to auto-link to
existing streams and topics in a Zulip message.
Also, does a little reformatting of existing text/tabs and
adds a related links section to the page.
Fixes#21085.
Co-authored-by: Alya Abbott <alya@zulip.com>
Lauryn Menard
Tim Abbott
Anders Kaseorg
Rishi Gupta