docs(chat): remove Gitter

Remove the mention of Gitter for chat that we don't use since a few
years. Keep recommending Forum and Mattermost as the two main
communication channels.

README.md

@@ -12,16 +12,17 @@ command-line client allows users to instantiate and run computational research d
 analysis workflows on remote containerised compute clouds. REANA was born to target the
 use case of particle physics analyses, but is applicable to any scientific discipline.
 
-This repository holds the REANA project web site. It uses
-[Lektor](https://www.getlektor.com/) static web site generator.
+This repository holds the REANA project web site [www.reana.io](https://www.reana.io).
 
-## Installation
+## Developing
+
+Build:
 
 ```console
 $ docker build -t docker.io/reanahub/wwwreanaio .
 ```
 
-## Running
+Run locally:
 
 ```console
 $ docker run --name wwwreanaio -d -p 8080:8080 docker.io/reanahub/wwwreanaio

run-tests.sh

@@ -36,7 +36,7 @@ check_shellcheck () {
 }
 
 check_docstyle () {
-    awesome_bot --allow-dupe --skip-save-results --allow-redirect --white-list https://reana.cern.ch,https://twitter.com/reanahub/lists/reana-developers,https://gitter.im/reanahub/reana,https://indico.ific.uv.es -- templates/**/*.html
+    awesome_bot --allow-dupe --skip-save-results --allow-redirect --white-list https://reana.cern.ch,https://twitter.com/reanahub/lists/reana-developers,https://indico.ific.uv.es -- templates/**/*.html
 }
 
 check_dockerfile () {

templates/footer.html

@@ -24,12 +24,6 @@ <h3 class="contact-title">Keep in touch</h3>
                   <a href="https://twitter.com/reanahub">@reanahub</a> <span class="hidden-xs">&middot;</span> <a class="text-nowrap" href="https://twitter.com/reanahub/lists/reana-developers"> developers</a>
                 </td>
               </tr>
-              <tr>
-                <td class="contact-list-header"><i class="fab fa-gitter"></i> Chat room</td>
-                <td>
-                  <a href="https://gitter.im/reanahub/reana"><img src="{{ '/static/img/gitter.svg'|asseturl }}"></a>
-                </td>
-              </tr>
               <tr>
                 <td class="contact-list-header"><i class="fab fa-github"></i> GitHub</td>
                 <td>
@@ -68,7 +62,7 @@ <h3 class="contact-title">Keep in touch</h3>
     <div class="container">
       <div class="row">
         <div class="col centered">
-          <span>Copyright © 2018-2022 CERN. Icons by <a href="http://fontawesome.io/">Font Awesome</a>.
+          <span>Copyright © 2018-2022, 2024 CERN. Icons by <a href="http://fontawesome.io/">Font Awesome</a>.
         </div>
       </div>
     </div>