feat(web): comprehensive cleanup - rewrite Rules/ToS/Privacy, unify emails

- rewrite Rules, Terms of Service, Privacy Policy with original mxchat content
  (replace tchncs.de and riot.im fork artifacts)
- unify all support contacts to podpora@oscloud.cz
- list real bridges (6 only): WhatsApp, Telegram, Signal, Meta, Discord, Gmessages
  removing non-running ones (Google Chat, Instagram, Steam)
- remove OSCloud apps (miniflux/pairdrop/wallabag) - belong on docs.oscloud.cz
- fix broken footer in kontakty/index.html
- fix broken https://mxchat.cz/contact links
- update outdated mentions (riot.im, vector.im → Element)

index/Bridges/index.html

@@ -48,15 +48,12 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
     <div class="main-content">
         <p>mxchat.cz podporuje integraci s mnoha dalšími komunikačními platformami pomocí mostů (bridges). Tyto mosty umožňují komunikaci napříč různými platformami přímo z Matrixu. Zde je seznam podporovaných mostů:</p>
         <ul>
-            <li><a href="https://github.com/tulir/mautrix-discord">Discord Bridge</a></li>
-            <li><a href="https://github.com/tulir/mautrix-googlechat">Google Chat Bridge</a></li>
-            <li><a href="../navody/signal.html">Signal Bridge</a></li>
-            <li><a href="https://github.com/tulir/mautrix-facebook">Meta Messenger Bridge</a></li>
-            <li><a href="https://github.com/tulir/mautrix-instagram">Instagram Bridge</a></li>
-            <li><a href="../navody/telegram.html">Telegram Bridge</a></li>
-            <li><a href="https://github.com/tulir/mautrix-gmessages">Google Messages Bridge</a></li>
-            <li><a href="../navody/whatsapp.html">WhatsApp Bridge</a></li>
-            <li><a href="https://github.com/matrix-hacks/mx-puppet-steam">Steam Bridge</a></li>
+            <li><a href="https://github.com/mautrix/whatsapp">WhatsApp Bridge</a></li>
+            <li><a href="https://github.com/mautrix/telegram">Telegram Bridge</a></li>
+            <li><a href="https://github.com/mautrix/signal">Signal Bridge</a></li>
+            <li><a href="https://github.com/mautrix/meta">Meta Messenger Bridge</a></li>
+            <li><a href="https://github.com/mautrix/discord">Discord Bridge</a></li>
+            <li><a href="https://github.com/mautrix/gmessages">Google Messages Bridge</a></li>
         </ul>
     </div>
     <footer class="site-footer">