Reorganize directories (#3462)

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

docs/mkdocs/docs/api/basic_json/rend.md

@@ -0,0 +1,43 @@
+# <small>nlohmann::basic_json::</small>rend
+
+```cpp
+reverse_iterator rend() noexcept;
+const_reverse_iterator rend() const noexcept;
+```
+
+Returns an iterator to the reverse-end; that is, one before the first element. This element acts as a placeholder,
+attempting to access it results in undefined behavior.
+
+![Illustration from cppreference.com](../../images/range-rbegin-rend.svg)
+
+## Return value
+
+reverse iterator to the element following the last element
+
+## Exception safety
+
+No-throw guarantee: this member function never throws exceptions.
+
+## Complexity
+
+Constant.
+
+## Examples
+
+??? example
+
+    The following code shows an example for `eend()`.
+    
+    ```cpp
+    --8<-- "examples/rend.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/rend.output"
+    ```
+
+## Version history
+
+- Added in version 1.0.0.