fix: Use button styling for account management link on index page

src/web/pages/resources/index.css

@@ -9,3 +9,7 @@
     color: transparent;
     filter: brightness(1.2);
 }
+
+.button {
+    margin: 0 !important;
+}

src/web/pages/templates/index.html.j2

@@ -15,7 +15,7 @@
     <p>For support, take a look at the <a href="https://continuwuity.org/introduction">documentation</a> or join the <a href="https://matrix.to/#/#continuwuity:continuwuity.org?via=continuwuity.org&via=ellis.link&via=explodie.org&via=matrix.org">Continuwuity Matrix room</a>.</p>
     {%- else %}
     <p>To get started, <a href="https://matrix.org/ecosystem/clients">choose a client</a> and connect to <code>{{ server_name }}</code>.</p>
-    <p><a href="{{ crate::ROUTE_PREFIX }}/account/">Manage your account</a></p>
+    <p><a class="button" href="{{ crate::ROUTE_PREFIX }}/account/">Manage your account</a></p>
     {%- endif %}
 </div>