Update name of git repo

Author: dngray

_includes/sections/instant-messenger.html

@@ -78,7 +78,7 @@ <h2 id="federated" class="anchor">
   website="https://element.io"
   privacy-policy="https://element.io/privacy"
   forum="https://forum.privacytools.io/t/discussion-element-io/665"
-  github="https://github.com/vector-im/riot-web/"
+  github="https://github.com/vector-im/element-web"
   windows="https://element.io/get-started"
   mac="https://element.io/get-started"
   linux="https://element.io/get-started"

_includes/sections/teamchat.html

@@ -17,7 +17,7 @@ <h1 id="teamchat" class="anchor">
   website="https://element.io"
   privacy-policy="https://element.io/privacy"
   forum="https://forum.privacytools.io/t/discussion-element-io/665"
-  github="https://github.com/vector-im/riot-web/"
+  github="https://github.com/vector-im/element-web"
   windows="https://element.io/get-started"
   mac="https://element.io/get-started"
   linux="https://element.io/get-started"

pages/services/chat.html

@@ -30,7 +30,7 @@ <h2 class="pt-4" id="homeserverinfo">Connection Information</h2>
   website="https://element.io"
   privacy-policy="https://element.io/privacy"
   forum="https://forum.privacytools.io/t/discussion-element-io/665"
-  github="https://github.com/vector-im/riot-web/"
+  github="https://github.com/vector-im/element-web"
   windows="https://element.io/get-started"
   mac="https://element.io/get-started"
   linux="https://element.io/get-started"