New location for Data Sets subtopic

What does the current documentation state?
In the first steps of setting up the FLINT development environment the documentation introduces the subtopic of Data Sets.

Where is this stated?
On FLINT Development Setup page (DevelopmentSetup\index.rst).

Why do you want to improve the statement?
This is not the right place to introduce this as the reader hasn't started installation of FLINT yet. It should be treated as it's own topic and introduced after installation is successful and the reader understands how to run simulations.

Proposed statement
I originally proposed to move this subtopic as part of #58 under the section for FLINT.example after the instructions on how to run the different modules. However, after discussion with @chicken-biryani and @shubhamkarande13 I agree with them that this is also not the best place.

Possibilities that we discussed:

• Remove it from installation instructions and move it to a blog post or use case on the community website with examples on how to use them.
• Create a separate page at the end of the installation instructions dedicated to this topic.

Additional info
This issue was created after discussion with @chicken-biryani and @shubhamkarande13 about #58

Start with docs/DevelopmentSetup/index.rst and locate the Data Sets subtopic. Review issue #58 and the discussion with the named contributors before choosing whether to remove the section or create a separate page. Done means the placement is agreed and the Development Setup page no longer introduces Data Sets before installation and simulation use.