Reorganize directories (#3462)

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

docs/examples/operator__notequal.output

@@ -0,0 +1,4 @@
+[1,2,3] != [1,2,4] true
+{"A":"a","B":"b"} != {"A":"a","B":"b"} false
+17 != 17.0 false
+"foo" != "bar" true