This commit rename the existing setting `Who can invite users to this
organization` to `Who can send email invitations to new users` and
also renames all the variables related to this setting that do not
require a change to the API.
This was done for better code readability as a new setting
`Who can create invite links` will be added in future commits.
Since an email address is not required to create a demo organization,
we need to disable some parts of the web-app UI until the owner of
the demo organization configures an email address for their account.
Addd `user_email_not_configured` check to `settings_data.ts` so
that we can check in various modules if the user is a demo
organization owner who has not configured an email address yet.
This adds `delivery_email` to `page_params.ts`. Also, adjusts the
`muted_users` in the list of page params so that the list is sorted
alphabetically.
This lets us simplify the long-ish ‘../../static/js’ paths, and will
remove the need for the ‘zrequire’ wrapper.
Signed-off-by: Anders Kaseorg <anders@zulip.com>