add note about mob computing in tools list

index.html

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     <li>a git forge (we like<span class="notranslate" dir="ltr" lang="eo"> forgejo</span>)</li>
     <li>a physical <span class="notranslate"> tilde </span> server (it can motivate everyone to create something together)</li>
     <li><strong>locations:</strong> living rooms, libraries, a cool local bookstore</li>
+    <li><strong>mob programming:</strong> a big monitor, tv, or a projector. computing together is fun and contributes to your computer club's culture!</li>
     <li><a href="https://awesome-selfhosted.net/">a very thorough resource for collective computing infrastructure</a></li>
     <li>connections to other local projects</li>
     <li><em>connections to other local projects</em></li>