UI: update prettier & eslint and re-prettify

Some new rules have been introduced. Keep everything up to date.

Change-Id: Id89711afab8433af956a464ee45c3aa57149a41b
diff --git a/ui/src/assets/sidebar.scss b/ui/src/assets/sidebar.scss
index 2966574..9a3e5c6 100644
--- a/ui/src/assets/sidebar.scss
+++ b/ui/src/assets/sidebar.scss
@@ -25,7 +25,8 @@
   display: flex;
   position: relative;
   flex-direction: column;
-  transition: margin-left var(--anim-easing) var(--sidebar-timing),
+  transition:
+    margin-left var(--anim-easing) var(--sidebar-timing),
     visibility linear var(--sidebar-timing);
   > * {
     border-bottom: 1px solid #404854;