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>

.gitignore

@@ -7,3 +7,5 @@ public/assets/*
 public/manifest.json
 opengist
 build/
+docs/.vitepress/dist/
+docs/.vitepress/cache/