text: Title: [DOC] Types of Contributions broken link
  Body: # Brief Description of Fix
  
  <!-- Please describe the fix in terms of a "before" and "after". In other words, what's not so good about the current docs
  page, and what you would like to see it become.
  
  Example starter wording is provided. -->
  
  Currently, the docs have a link within `CONTRIBUTING.rst` the links **types of Contributions** to https://github.com/ericmjl/pyjanitor/blob/dev/CONTRIBUTION_TYPES.html
  
  I would like to propose a change, such that now the docs links the above to the docs website (https://ericmjl.github.io/pyjanitor/CONTRIBUTION_TYPES.html)
  
  # Relevant Context
  
  <!-- Please put here, in bullet points, links to the relevant docs page. A few starting template points are available
  to get you started. -->
  
  - [Link to documentation page](https://github.com/ericmjl/pyjanitor/blob/dev/CONTRIBUTING.rst)
  - [Link to exact file to be edited](https://github.com/ericmjl/pyjanitor/blob/dev/CONTRIBUTING.rst)
  