Remove twitter and meetup links

Author: bcremer

README.md

@@ -2,8 +2,6 @@
 
 <img src="assets/phpugms-logo.svg" width="200">
 
-* Find upcoming meetups on [Meetup](https://www.meetup.com/phpugms/)
-* Follow us on [Twitter](https://twitter.com/phpugms/)
 * Follow us on <a rel="me" href="https://phpc.social/@phpugms">Mastodon</a>
 * Contribute Slides and links on [GitHub](https://github.com/phpugms/)
 * Chat with us in the `#phpugms` room on the [PHPUG Slack](https://phpug.slack.com/) (Get your [Invite](https://php.ug/slackinvite))