DOC Add link to Bluesky in social media sections (scikit-learn#30365)

Author: reshamas

README.rst

@@ -192,6 +192,7 @@ Communication
 - GitHub Discussions: https://github.com/scikit-learn/scikit-learn/discussions
 - Website: https://scikit-learn.org
 - LinkedIn: https://www.linkedin.com/company/scikit-learn
+- Bluesky: https://bsky.app/profile/scikit-learn.org
 - YouTube: https://www.youtube.com/channel/UCJosFjYm0ZYVUARxuOZqnnw/playlists
 - Facebook: https://www.facebook.com/scikitlearnofficial/
 - Instagram: https://www.instagram.com/scikitlearnofficial/

doc/developers/maintainer.rst.template

@@ -133,7 +133,7 @@ Reference Steps
         {%- if key != "rc" %}
         * [ ] Publish to https://github.com/scikit-learn/scikit-learn/releases
         {%- endif %}
-        * [ ] Announce on mailing list and on Twitter, and LinkedIn
+        * [ ] Announce on mailing list and on LinkedIn, Bluesky, Twitter
         {%- if key != "rc" %}
         * [ ] Update SECURITY.md in main branch
         {%- endif %}

doc/templates/index.html

@@ -230,8 +230,9 @@ <h4 class="sk-landing-call-header">Community</h4>
           <li><strong>Blog:</strong> <a href="https://blog.scikit-learn.org">blog.scikit-learn.org</a></li>
           <li><strong>Logos & Branding:</strong> <a href="https://github.com/scikit-learn/scikit-learn/tree/main/doc/logos">logos and branding</a></li>
           <li><strong>Calendar:</strong> <a href="https://blog.scikit-learn.org/calendar/">calendar</a></li>
-          <li><strong>Twitter:</strong> <a href="https://twitter.com/scikit_learn">@scikit_learn</a></li>
           <li><strong>LinkedIn:</strong> <a href="https://www.linkedin.com/company/scikit-learn">linkedin/scikit-learn</a></li>
+          <li><strong>Bluesky:</strong> <a href="https://bsky.app/profile/scikit-learn.org">bluesky/scikit-learn.org</a></li>
+          <li><strong>Twitter:</strong> <a href="https://twitter.com/scikit_learn">@scikit_learn</a></li>        
           <li><strong>YouTube:</strong> <a href="https://www.youtube.com/channel/UCJosFjYm0ZYVUARxuOZqnnw/playlists">youtube.com/scikit-learn</a></li>
           <li><strong>Facebook:</strong> <a href="https://www.facebook.com/scikitlearnofficial/">@scikitlearnofficial</a></li>
           <li><strong>Instagram:</strong> <a href="https://www.instagram.com/scikitlearnofficial/">@scikitlearnofficial</a></li>