message: Remove unused link from /about page
diff: <p>
  <a href="https://github.com/previousdeveloper/PythonPostcodesWrapper">PythonPostcodesWrapper</a> by <a href="https://github.com/previousdeveloper">Gokhan Karadas</a><br>
  <a href="https://github.com/raigad/python-postcodes-io">postcodes_io_api</a> by <a href="https://github.com/raigad">Rohit Deshmukh</a> (<a href="https://pypi.org/project/postcodes-io-api/">Python Package</a>)
  - <a href="https://github.com/raigad/python-postcodes-io"></a>
  </p>
  <p>
  <strong>C&#35;</strong>
  