Revert "Hide sign in / create account for logged in users"

We no longer need this when it's used as a welcome page outside the app.

This reverts commit a74ac336e5.

res/home.html

@@ -100,18 +100,6 @@ h1::after {
   margin: 28px 0;
 }
 
-.mx_ButtonRow_guest {
-    display: none;
-}
-
-/* mx_HomePage_guest is set on the `HomePage` component for guest users */
-.mx_HomePage_guest .mx_ButtonRow_guest {
-    display: -webkit-box;
-    display: -webkit-flex;
-    display: -ms-flexbox;
-    display: flex;
-}
-
 .mx_buttonheadline {
   margin-bottom: 14px;
 }
@@ -174,7 +162,7 @@ h1::after {
     <h1 class="mx_Header2">_t("Welcome to Riot.im")</h1>
     <h4 class="mx_Header22">_t("Decentralised, encrypted chat &amp; collaboration powered by [matrix]")</h4>
     <div class="mx_Well">
-        <div class="mx_ButtonRow mx_ButtonRow_guest">
+        <div class="mx_ButtonRow">
             <a href="#/login" class="mx_ButtonParent mx_ButtonSignIn mx_Button_iconSignIn">
                 <div class="mx_buttonlabel">_t("Sign In")</div>
             </a>