templates/_base: Add logout button to nav bar

frontend/src/main.less

@@ -135,6 +135,13 @@ nav {
 
 	#nav-links {
 		padding: 0;
+		flex-grow: 1;
+	}
+
+	#logout {
+		@media screen and (min-width: @mobile_threshold) {
+			margin-left: auto;
+		}
 	}
 
 	@media screen and (max-width: @mobile_threshold) {

schilder2000/templates/_base.html.j2

@@ -61,6 +61,9 @@
 					<div id="nav-links">
 						<a {{ maybe_active_href("views.index") }}>Startseite</a>
 						<a {{ maybe_active_href("views.create") }}>Neues Schild</a>
+						{%- if "identity" in session -%}
+							<a href="{{ url_for('views.logout') }}" id="logout">Abmelden</a>
+						{%- endif -%}
 					</div>
 				</nav>
 			{%- endblock nav -%}