Reorganize directories (#3462)

* 🚚 move files
* 🚚 rename doc folder to docs
* 🚚 rename test folder to tests

docs/examples/std_hash.output

@@ -0,0 +1,8 @@
+hash(null) = 2654435769
+hash(false) = 2654436030
+hash(0) = 2654436095
+hash(0U) = 2654436156
+hash("") = 11160318156688833227
+hash({}) = 2654435832
+hash([]) = 2654435899
+hash({"hello": "world"}) = 3701319991624763853