replace slack with zulip

Author: mblue9

README.md

@@ -58,7 +58,7 @@ Published in *PLOS Computational Biology*
 ### New lessons
 
 If you are interested in contributing new lessons or Carpentry modules,
-feel free to get in touch with the teaching committee via slack of the
+feel free to get in touch with the teaching committee via Zulip or the
 google group (see below). We would be happy to discuss and/or contribute
 to anything related to the lesson design, general help with the long-term
 maintenance, dissemination of the lesson, or any help/topic you can think of.
@@ -116,7 +116,7 @@ welcome to join the discussion.
 ## Discussions
 
 - The `education-and-training` channel on the [Bioconductor community
-  slack](https://slack.bioconductor.org/).
+  chat](https://chat.bioconductor.org/).
 - The [Google group](https://groups.google.com/g/bioconductor-teaching/) (low-traffic, mainly used to send a reminder for the monthly meeting).  
 
 ## Events

images/icons/svgs/zulip-white-icon.svg

@@ -1,14 +1,26 @@
-<footer>
+<footer class="dark-footer">
   <div class="footer-container">
     <div class="footer-content">
       <p>© 2003 - 2025 Bioconductor | Join the Bioconductor Community</p>
       <div class="footer-socials">
-        <a href="https://slack.bioconductor.org/" target="_blank"><img alt="Slack Logo" src="/images/icons/slack.png" /></a>
-        <a href="https://www.youtube.com/user/bioconductor" target="_blank"><img alt="YouTube Logo" src="/images/icons/svgs/youtube.svg" /></a>
-        <a href="https://www.linkedin.com/company/bioconductor/" target="_blank"><img alt="LinkedIn Logo" src="/images/icons/svgs/linkedin.svg" /></a>
-        <a href="https://bsky.app/profile/bioconductor.bsky.social" target="_blank"><img alt="Bluesky Logo" src="/images/icons/svgs/bluesky.svg" /></a>
-        <a href="https://genomic.social/@bioconductor" target="_blank"><img alt="Mastodon Logo" src="/images/icons/svgs/mastodon.svg" /></a>
-        <a href="https://blog.bioconductor.org/" target="_blank"><img alt="Blog Logo" src="/images/icons/svgs/arrow-circle-right-white.svg" /></a>
+        <a href="https://chat.bioconductor.org/" target="_blank" title="Join the Bioconductor Community Chat (powered by Zulip)">
+          <img alt="Zulip Logo" src="/images/icons/svgs/zulip-white-icon.svg" />
+        </a>
+        <a href="https://www.youtube.com/user/bioconductor" target="_blank" title="Bioconductor on YouTube">
+          <img alt="YouTube Logo" src="/images/icons/svgs/youtube.svg" />
+        </a>
+        <a href="https://www.linkedin.com/company/bioconductor/" target="_blank" title="Bioconductor on LinkedIn">
+          <img alt="LinkedIn Logo" src="/images/icons/svgs/linkedin.svg" />
+        </a>
+        <a href="https://bsky.app/profile/bioconductor.bsky.social" target="_blank" title="Bioconductor on Bluesky">
+          <img alt="Bluesky Logo" src="/images/icons/svgs/bluesky.svg" />
+        </a>
+        <a href="https://genomic.social/@bioconductor" target="_blank" title="Bioconductor on Mastodon">
+          <img alt="Mastodon Logo" src="/images/icons/svgs/mastodon.svg" />
+        </a>
+        <a href="https://blog.bioconductor.org/" target="_blank" title="Bioconductor Blog">
+          <img alt="Blog Logo" src="/images/icons/svgs/arrow-circle-right-white.svg" />
+        </a>
       </div>
     </div>
   </div>

layouts/components/footer.html

@@ -17,7 +17,7 @@ Books	[Bioconductor Books](https://bioconductor.org/help/bioconductor-books)			X
 Books	[R packages/Advanced R](https://adv-r.hadley.nz/)		X				X
 Books	[Bioconductor contributor guide](https://contributions.bioconductor.org)						X
 Community	[Support Site](https://support.bioconductor.org)	X	X	X	X	X	
-Community	[Slack](https://slack.bioconductor.org)	X	X	X	X	X	X
+Community	[Chat](https://chat.bioconductor.org)	X	X	X	X	X	X
 Community	[Developer Mailing List](https://stat.ethz.ch/mailman/listinfo/bioc-devel)				X		X
 Community	[Bioconductor YouTube channel](https://www.youtube.com/user/bioconductor)			X		X	
 Community	"Special Interest Groups (e.g. R-Ladies, R User Groups)"				X