Integrate MAS with Synapse

mas/share/templates/pages/index.html

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+{#
+Copyright 2024, 2025 New Vector Ltd.
+Copyright 2021-2024 The Matrix.org Foundation C.I.C.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+-#}
+
+{% extends "base.html" %}
+
+{% block content %}
+  <main class="flex flex-col justify-center gap-6">
+    <header class="page-heading">
+      <div class="header">
+        <h1 class="title">{{ _("app.human_name") }}</h1>
+        <p class="text">
+          {{ _("app.technical_description", discovery_url=discovery_url) }}
+        </p>
+      </div>
+    </header>
+
+    {% if current_session is not none %}
+      <p class="cpd-text-body-md-regular">
+        {{ _("mas.navbar.signed_in_as", username=current_session.user.username) }}
+      </p>
+
+      {{ button.link(text=_("mas.navbar.my_account"), href="/account/") }}
+      {{ logout.button(text=_("action.sign_out"), csrf_token=csrf_token) }}
+    {% else %}
+      {{ button.link(text=_("action.sign_in"), href="/login") }}
+
+      {% if features.password_registration %}
+        {{ button.link_outline(text=_("mas.navbar.register"), href="/register") }}
+      {% endif %}
+    {% endif %}
+  </main>
+{% endblock content %}