(cq) add alt attribute on logo

src/Logo.vue

@@ -17,9 +17,9 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 <template>
     <div v-bind:class="classes">
         <a v-if="link !== null" v-bind:href="link">
-            <img v-bind:src="image">
+            <img v-bind:src="image" alt="Logo">
         </a>
-        <img v-else v-bind:src="image">
+        <img v-else v-bind:src="image" alt="Logo">
     </div>
 </template>