docs(website): add json docs and vue version recommendation

Author: christianalfoni

packages/overmind-website/api/json.md

@@ -0,0 +1,9 @@
+# Json
+
+Overmind wraps objects and arrays in your state structure with proxies. If you pass state to 3rd party libraries, to a service worker or similar, you should pass a long a copy of that state. This avoids the 3rd party tool from mutating your state when you do not want it to.
+
+```marksy
+h(Example, { name: "api/json" })
+```
+
+This function does a copy of any plain object or array, which are the only values that is wrapped with proxies. This ensures minimal work is done and keeps all other values alone.