Improvements

• Show status changes (flips) in check's log page (#447)
• Implement dynamic favicon in the projects overview page (#971)
• Add support for system theme (#978, @moraj-turing)
• Improve Opsgenie notifications (include description, schedule, link etc.)
• Update the Discord integration to disable channel on HTTP 404 responses
• Update email notifications to include the timestamps of status flips
• Update the Sign In page to hide "Email Link" option if SMTP is not configured (#922)
• Update Slack integration to use channel name as the integration name (#1003)
• Update Ping Details dialog to also show formatted datetimes (#975)
• Add data migration to update legacy timezones to current canonical timezones

Bug Fixes

• Fix hc.front.views.docs_search to handle words "AND", "OR", "NOT" as queries
• Fix integrations to not disclose check's code in incident data
• Fix integrations to include oncalendar schedules in notifications
• Fix a bug in the log page that caused log events to sometimes load twice