remove refs to MaptimeHQ twitter and add Mastodon and Bluesky links

Author: almccon

CONTRIBUTING.md

@@ -13,7 +13,8 @@ Need a question answered?
 
 If you have questions on contributing to Maptime.io, direct them to one of the following:
 
-- We're on Twitter at [@maptimeHQ](http://twitter.com/maptimehq)
+- We're on Mastodon at [@maptime@mapstodon.space](https://mapstodon.space/maptime)
+- We're on Bluesky at [@maptime.bsky.social](https://bsky.app/profile/maptime.bsky.social)
 - Email us at [MaptimeHQ [at] gmail.com](mailto:MaptimeHQ@gmail.com)
 
 Found an issue?

_config.yml

@@ -6,7 +6,6 @@ repo: maptime.github.io
 github_org: maptime
 maptime:
   chapter: Maptime HQ
-  twitter: maptimehq
   #disqus: YOUR DISQUS USERNAME 
 
 future: true

chapters/start.md

@@ -37,7 +37,7 @@ Keep things simple by naming your folder after your city.
 1. Finally, click the big shiny green __Create Pull Request__ button. It's ok, you won't break anything. Extra points if you tag an admin with Maptime to notify them of changes (e.g. @geografa).
 ![start-pr-msg](/img/start-pr-msg.png)
 
-Someone from the Maptime admin team will review changes and either merge them in or comment back with questions or suggested modifications. If changes are requested before merging, simply make the changes in your file and commit the changes. No need to make another PR if the one you made is still open. Neat huh? Good luck and as always create an [issue](https://github.com/maptime/maptime.github.io/issues/new) with your questions, send us a [tweet](https://twitter.com/MaptimeHQ), or find us on the [Slack](https://maptime.slack.com/messages/website-admin/) chat channel for more help.
+Someone from the Maptime admin team will review changes and either merge them in or comment back with questions or suggested modifications. If changes are requested before merging, simply make the changes in your file and commit the changes. No need to make another PR if the one you made is still open. Neat huh? Good luck and as always create an [issue](https://github.com/maptime/maptime.github.io/issues/new) with your questions, send us a message on [Mastodon](https://mapstodon.space/maptime) or [Bluesky](https://bsky.app/profile/maptime.bsky.social), or find us on the [Slack](https://maptime.slack.com/messages/website-admin/) chat channel for more help.
 
 <iframe src="//player.vimeo.com/video/110047746" width="100%" height="360" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> 
 _[Adding a Maptime Chapter](http://vimeo.com/98781289)_

contact/index.html

@@ -13,7 +13,7 @@ <h4>Are you interested in starting a local Maptime chapter in your area?</h4>
 for further instructions.</p>
 
 <h4>Where are you on the social medias?</h4>
-<p>Follow <a href="http://twitter.com/maptimeHQ" target="_blank">@maptimeHQ</a> on Twitter for general announcements, along with the handle of your favorite chapters.</p>
+<p>Follow <a href="https://mapstodon.space/maptime" target="_blank">@maptime@mapstodon.space</a> on Mastodon or <a href="https://bsky.app/profile/maptime.bsky.social">@maptime.bsky.social</a> on Bluesky for general announcements, along with the handle of your favorite chapters.</p>
 
 <p><h4>Do you want to give us money or just have some other question?</h4>
 <p>Drop us a line: <a href="mailto:MaptimeHQ@gmail.com">MaptimeHQ@gmail.com</a>.</p>