text: Title: reST: Support explicit titles for cross-references
  Body: #### Problem Description
  
  I would like to `.. include:: ../README.rst` in my `__init__.py` module docstring. However, it appears to be parsed as markdown, despite the fact that it has the appropriate file extension and my docstring format is set to rst (i.e. left as default). Is this a missing feature, or am I doing something wrong?
  
  > `__init__.py`
  ```python
  """
  .. include:: ../README.rst
  """
  ```
  
  > `README.rst`
  ```
  ...
  A :ref:`Task` is connected to repositories through **:ref:`links <Link>`**. A link is a repository plus a collection of properties describing the repository's relationship to the task - i.e. whether it is input or output, whether it should inhibit dependent tasks from starting, etc.
  ...
  ```
  
  > rendered
  
  ![contains :ref: and other ReST junk](https://user-images.githubusercontent.com/2498805/208203771-94205328-0e86-476c-ac2e-27618511e33f.png)
  
  #### System Information
  
  ```
  pdoc: 12.3.0
  Python: 3.10.6
  Platform: Linux-5.17.0-1021-oem-x86_64-with-glibc2.35
  ```
  