bring wording more in line with https://delta.chat (#1018)

and don't talk so much about accounts :)

38c3.html

@@ -107,18 +107,14 @@ <h2>Delta Chat @ 38c3</h2>
         alt="deltachat logo"
       />
       <p>
-        Delta Chat uses the existing email infrastructure for Messaging, it
-        enables you to use email for chatting and reach anyone that uses email.
+        Delta Chat is a decentralized and secure messenger app
       </p>
     </div>
     <p>
-      💬 Message anyone with an e-mail address
-      <a href="https://www.youtube-nocookie.com/embed/8LbrGXKZN70"
-        >even if they don’t use Delta Chat</a
-      >.
+      💬 Reliable instant messaging with multi-profile and multi-device support
     </p>
     <p>
-      🥳 Enjoy interactive chat experiences through
+      🥳 Enjoy interactive and P2P/realtime chat experiences through
       <a href="https://webxdc.org">webxdc apps</a>.
     </p>
     <p>
@@ -133,26 +129,20 @@ <h2>Delta Chat @ 38c3</h2>
     </p>
 
     <h2 id="test-delta-chat-without-registration">
-      Try Delta Chat
+      Try Delta Chat and join @38c3 group (no account required)
     </h2>
-    <p>
-      No one likes creating new accounts when you just want to quickly try an
-      app, that&#39;s why we created chatmail, a email server where you can get
-      a slot/account with just a qr code scan: no personal details required, not
-      even a password.
-    </p>
     <ol>
       <li>
         <p>
-          Download Delta Chat on your device:
+          Download and install Delta Chat on your device:
           <a href="https://get.delta.chat">https://get.delta.chat</a> (available
           for Android, iOS, Linux, Windows, MacOS and even Ubuntu Touch /
           Ubports)
         </p>
       </li>
       <li>
         <p>
-          Scan or tap/click the qr code to get an account instantly and join the event group:
+          To join the 38c3 Delta Chat group, scan or tap or click the qr code:
           <br />
           <a
             href="https://i.delta.chat/#6FE1642916908F1AC9CC7557CC99CF5DDB92043C&a=groupsbot%40testrun.org&g=Delta%20Chat%20%40%2038c3&x=GjWs3QctuRW__Bt8nBQUdeht&i=_AG0Px0PlWZ&s=LR9BivV4QtJ"
@@ -165,9 +155,8 @@ <h2 id="test-delta-chat-without-registration">
       </li>
     </ol>
     <p>
-      The chatmail account you get is limited (can&#39;t send unencrypted
-      messages to the outside for example), read more at:
-      <a href="https://delta.chat/chatmail">delta.chat/chatmail</a>
+      We recommend you set an "avatar" and a nice nickname
+      and then say "hi" in the group :)
     </p>
 
     <h2 id="our-sessions">Our Sessions</h2>