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/components/external-action-modal.js

@@ -84,7 +84,7 @@ export default class ExternalActionModal extends Component {
                     >
                       <iframe
                         id="external-modal-iframe"
-                        style=${iframeStyle}
+                        style=${{ iframeStyle }}
                         class="bg-gray-100 bg-center bg-no-repeat"
                         width="100%"
                         allowpaymentrequest="true"