This help center article should include more features rather than just
focusing on the "go to conversation" button. We should broaden and
restructure this page to cover other advanced features.
Refactors the "Go to conversation" section as step-by-step instructions,
and adds a `keyboard_tip`.
Adds new section "Toggle between Ctrl+Enter and Enter".
Deletes the "Enable Enter to send" help center article, and adds its
content as a new subheading in this section.
Updates existing links accordingly and adds a URL redirect.
Documents "Enable Control + Enter to send".
Tweaks intro paragraph of "Mastering the compose box".
Fixes: #22817.
Updates references to keyboard keys in the help center docs to use
`<kbd>` HTML elements, which also means updating them to be as the
key would appear on a keyboard.
Previously, uppercase and lowercase letters were used to indicate
when/if the `Shift` key was being used, and even that was not
consistent throughout the documentation.
For CSS styling, adds a similar rule for `<kbd>` elements that is
used in `/static/styles/app_components.css`. And updates the CSS
class used in `/static/js/portico/help.js` for `adjust_mac_shortcuts`
accordingly.
Also, takes advantage of revising these pages for making small
updates for current help center documentation practices.
Adds an article for more advanced techniques and workflows for
the compose box and documents the new 'Go to conversation' button.
Also adds cross-links between compose box articles.
Fixes#21959.
Co-authored-by: Alya Abbott <alya@zulip.com>