no issue
The full edit newsletter form with all the settings, design options, and preview felt quite overwhelming when the only piece of data that's required to create a newsletter is the name.
- re-organised the newsletter modal components by renaming `modals/edit-newlsetter` to `modals/newsletters` to better represent the full suite of modals that are used in newsletter management
- added a `modals/newsletters/new` component containing a minimal form with name/description/opt-in-existing fields
- switched the `new-newsletter` route to open the new modal rather than the previous dual-purpose edit modal
- moved message about newsletter creation into the create modal and dropped the separate create confirmation modal
- dropped unnecessary unsaved-changes confirmation
- removed the now-unused opt-in-existing behaviour from the edit newsletter modal
Co-authored-by: Peter Zimon <peter.zimon@gmail.com>
