move error component to standalone

src/components/error/error.tsx

@@ -0,0 +1,16 @@
+import { Component, Show } from "solid-js";
+import css from './error.module.css';
+
+export const ErrorComp: Component<{ error: Error }> = (props) => {
+    return <div class={css.error}>
+        <b>{props.error.message}</b>
+
+        <Show when={props.error.cause}>{
+            cause => <>{cause().description}</>
+        }</Show>
+
+        {props.error.stack}
+
+        <a href="/">Return to start</a>
+    </div>;
+};