add eslint config (#53)

* eslint

* workflow

* lint main

src/components/Flex.tsx

@@ -1,5 +1,4 @@
-import { PropsWithChildren } from "react";
-import type { React } from '../webpack/common';
+import type { React } from "../webpack/common";
 
 export function Flex(props: React.PropsWithChildren<{
     flexDirection?: React.CSSProperties["flexDirection"];