Reorganize directories (#3462)

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

docs/mkdocs/docs/api/basic_json/out_of_range.md

@@ -0,0 +1,68 @@
+# <small>nlohmann::basic_json::</small>out_of_range
+
+```cpp
+class out_of_range : public exception;
+```
+
+This exception is thrown in case a library function is called on an input parameter that exceeds the expected range, for
+instance in case of array indices or nonexisting object keys.
+
+Exceptions have ids 4xx (see [list of out-of-range errors](../../home/exceptions.md#out-of-range)).
+
+```plantuml
+std::exception <|-- basic_json::exception
+basic_json::exception <|-- basic_json::parse_error
+basic_json::exception <|-- basic_json::invalid_iterator
+basic_json::exception <|-- basic_json::type_error
+basic_json::exception <|-- basic_json::out_of_range
+basic_json::exception <|-- basic_json::other_error
+
+interface std::exception {}
+
+class basic_json::exception {
+    + const int id
+    + const char* what() const
+}
+
+class basic_json::parse_error {
+    + const std::size_t byte
+}
+
+class basic_json::out_of_range #FFFF00 {}
+```
+
+## Member functions
+
+- **what** - returns explanatory string
+
+## Member variables
+
+- **id** - the id of the exception
+
+## Examples
+
+??? example
+
+    The following code shows how a `out_of_range` exception can be caught.
+    
+    ```cpp
+    --8<-- "examples/out_of_range.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/out_of_range.output"
+    ```
+
+## See also
+
+- [List of out-of-range errors](../../home/exceptions.md#out-of-range)
+- [`parse_error`](parse_error.md) for exceptions indicating a parse error
+- [`invalid_iterator`](invalid_iterator.md) for exceptions indicating errors with iterators
+- [`type_error`](type_error.md) for exceptions indicating executing a member function with a wrong type
+- [`other_error`](other_error.md) for exceptions indicating other library errors
+
+## Version history
+
+- Since version 3.0.0.