Add web front-end and fix API issues

node_modules/concurrently/dist/lib/jsonc.d.ts

@@ -0,0 +1,8 @@
+declare const JSONC: {
+    parse: (text: string) => any;
+    stringify: {
+        (value: any, replacer?: (this: any, key: string, value: any) => any, space?: string | number): string;
+        (value: any, replacer?: (number | string)[] | null, space?: string | number): string;
+    };
+};
+export default JSONC;