Improve customization of welcome page

roles/matrix-riot-web/defaults/main.yml

@@ -32,6 +32,12 @@ matrix_riot_web_welcome_user_id: "@riot-bot:matrix.org"
 # Branding of riot web
 matrix_riot_web_brand: "Riot"
 
+matrix_riot_web_welcome_logo: "welcome/images/logo.svg"
+matrix_riot_web_welcome_logo_link: "https://riot.im"
+
+matrix_riot_web_welcome_headline: "_t('Welcome to Riot.im')"
+matrix_riot_web_welcome_text: "_t('Decentralised, encrypted chat & collaboration powered by [matrix]')"
+
 # By default, there's no Riot homepage (when logged in). If you wish to have one,
 # point this to a `home.html` template file on your local filesystem.
 matrix_riot_web_embedded_pages_home_path: ~

roles/matrix-riot-web/templates/welcome.html.j2

@@ -153,11 +153,11 @@ h1::after {
 </style>
 
 <div class="mx_Parent">
-    <a href="https://riot.im" target="_blank" rel="noopener">
-        <img src="welcome/images/logo.svg" alt="" class="mx_Logo"/>
+    <a href="{{ matrix_riot_web_welcome_logo_link }}" target="_blank" rel="noopener">
+        <img src="{{ matrix_riot_web_welcome_logo }}" alt="" class="mx_Logo"/>
     </a>
-    <h1 class="mx_Header_title">_t("Welcome to Riot.im")</h1>
-    <h4 class="mx_Header_subtitle">_t("Decentralised, encrypted chat &amp; collaboration powered by [matrix]")</h4>
+    <h1 class="mx_Header_title">{{ matrix_riot_web_welcome_headline }}</h1>
+    <h4 class="mx_Header_subtitle">{{ matrix_riot_web_welcome_text }}</h4>
     <div class="mx_ButtonGroup">
         <div class="mx_ButtonRow">
             <a href="#/login" class="mx_ButtonParent mx_ButtonSignIn mx_Button_iconSignIn">