Rename config to settings

tools/settings.ts

@@ -0,0 +1,17 @@
+export function loadSettings(path: string): Settings | null {
+  const item = localStorage.getItem(path);
+  if (!item) {
+    return null;
+  }
+
+  try {
+    return JSON.parse(item) as Settings;
+  } catch (e) {
+    return null;
+  }
+}
+
+export interface Settings {
+  searchUrl: string;
+	searchBar: boolean,
+}