Add Vitepress docs (#326)

* Add vitepress for docs

* some fix

* Use vitepress and update docs

* Use vitepress and update docs

* Update README.md

* Add favicon

* Add docs by @jiriks74

Co-authored-by: jiriks74 <jiri@stefka.eu>

---------

Co-authored-by: jiriks74 <jiri@stefka.eu>

docs/.vitepress/theme/index.ts

@@ -0,0 +1,12 @@
+import { h } from 'vue'
+import type { Theme } from 'vitepress'
+import DefaultTheme from 'vitepress/theme'
+import Layout from "./Layout.vue";
+
+export default {
+  ...DefaultTheme,
+  Layout,
+  enhanceApp({ app, router, siteData }) {
+    // ...
+  }
+} satisfies Theme