Deprecation: send email notifications for config file v2 (#10415)
* Update deprecated_config_file_used_email.html
* Apply suggestions from code review
Co-authored-by: Anthony <aj@ohess.org>
Co-authored-by: Benjamin Balder Bach <benjamin@readthedocs.org>
* Show up to 15 projects
If there are more projects, add an extra line saying there are more projects.
* Refactor: move `extra_context` from SiteNotification to its parent
* Notifications: update templates and send emails
* Template: minor update
* Update readthedocs/templates/projects/notifications/deprecated_config_file_used_email.html
Co-authored-by: Benjamin Balder Bach <benjamin@readthedocs.org>
* Minor English things :)
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Co-authored-by: Manuel Kaufmann <humitos@gmail.com>
Co-authored-by: Anthony <aj@ohess.org>
Co-authored-by: Benjamin Balder Bach <benjamin@readthedocs.org>