[mod] theme/simple: fmt/lint minor pass

*Safe* changes, no behaviour changes.

- Initial ES5 to ES2015+ conversion.
- Plenty of styling diff changes.

client/simple/tools/plg.js

@@ -8,8 +8,7 @@
  *   needed.
  */
 
-import { svg2png } from "./img.js";
-import { svg2svg } from "./img.js";
+import { svg2png, svg2svg } from "./img.js";
 
 /**
  * Vite plugin to convert a list of SVG files to PNG.
@@ -18,9 +17,11 @@ import { svg2svg } from "./img.js";
  */
 function plg_svg2png(items) {
   return {
-    name: 'searxng-simple-svg2png',
-    apply: 'build', // or 'serve'
-    async writeBundle() { svg2png(items); },
+    name: "searxng-simple-svg2png",
+    apply: "build", // or 'serve'
+    async writeBundle() {
+      svg2png(items);
+    }
   };
 }
 
@@ -32,9 +33,11 @@ function plg_svg2png(items) {
  */
 function plg_svg2svg(svgo_opts, items) {
   return {
-    name: 'searxng-simple-svg2png',
-    apply: 'build', // or 'serve'
-    async writeBundle() { svg2svg(items, svgo_opts); },
+    name: "searxng-simple-svg2png",
+    apply: "build", // or 'serve'
+    async writeBundle() {
+      svg2svg(items, svgo_opts);
+    }
   };
 }