Outbound live stream notifications (#1663)

* First pass at browser, discord, twilio notifications

* Commit updated Javascript packages

* Remove twilio notification support

* Email notifications/smtp support

* Fix Firefox notification support, remove chrome checks

* WIP more email work

* Add support for twitter notifications

* Add stream title to discord and twitter notifications

* Update notification registration modal

* Fix hide/show email section

* Commit updated API documentation

* Commit updated Javascript packages

* Fix post-rebase missing var

* Remove unused var

* Handle unsubscribe errors for browser push

* Standardize email config prop names

* Allow overriding go live email template

* Some notifications cleanup

* Commit updated Javascript packages

* Remove email/smtp/mailjet support

* Remove more references to email notifications

Co-authored-by: Owncast <owncast@owncast.online>

webroot/js/web_modules/import-map.json

@@ -6,6 +6,7 @@
     "mark.js/dist/mark.es6.min.js": "./markjs/dist/mark.es6.min.js",
     "micromodal/dist/micromodal.min.js": "./micromodal/dist/micromodal.min.js",
     "preact": "./preact.js",
+    "preact/hooks": "./preact/hooks.js",
     "tailwindcss/dist/tailwind.min.css": "./tailwindcss/dist/tailwind.min.css",
     "video.js/dist/video-js.min.css": "./videojs/dist/video-js.min.css",
     "video.js/dist/video.min.js": "./videojs/dist/video.min.js"