Update developers.rst with enhanced restructured text formatting for development environment set up

[LexiconCode]

While reStructuredText is more powerful than markdown it is more complicated to format in my opinion. To assist in this process a tool like this may be helpful for others. cloudconvert

I did not build the documentation however github was able to display it as expected as it supports md and rst.

[quintijn]

I will run the documentation when I am back home in the weekend...