Reorganize directories (#3462)

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

docs/mkdocs/docs/api/basic_json/other_error.md

@@ -0,0 +1,67 @@
+# <small>nlohmann::basic_json::</small>other_error
+
+```cpp
+class other_error : public exception;
+```
+
+This exception is thrown in case of errors that cannot be classified with the other exception types.
+
+Exceptions have ids 5xx (see [list of other errors](../../home/exceptions.md#further-exceptions)).
+
+```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::other_error #FFFF00 {}
+```
+
+## Member functions
+
+- **what** - returns explanatory string
+
+## Member variables
+
+- **id** - the id of the exception
+
+## Examples
+
+??? example
+
+    The following code shows how a `other_error` exception can be caught.
+    
+    ```cpp
+    --8<-- "examples/other_error.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/other_error.output"
+    ```
+
+## See also
+
+- [List of other errors](../../home/exceptions.md#further-exceptions)
+- [`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
+- [`out_of_range`](out_of_range.md) for exceptions indicating access out of the defined range
+
+## Version history
+
+- Since version 3.0.0.