hotfix: Newsletter btn-align

Author: WManzoli

src/.vuepress/theme/components/Newsletter.vue

@@ -72,8 +72,8 @@
     padding: 4px 20px;
     margin: 0;
     min-height: calc(100% - 8px);
-    right: 4px;
-    top: 4px;
+    right: 0px;
+    top: 0px;
     font-size: 1.05em;
     font-weight: 600;
     letter-spacing: 0.1em;