Update and tidy Working Environments section

[dougiesquire]

Specifically, Accessing Data section should focus on describing and pointing to exisiting catalogues/data-sources that people can utilize from the Compute Platforms. Technical details of tools (e.g. Intake) can be pointed to in the Software section.

[hot007]

@dougiesquire Is it okay if Paola starts to work on this in her next PR which you can then review/update?

[hot007]

Proposal:

1. reverse the order of the two 'accessing data' pages so that the tangible examples come first and conceptual stuff second for those who are interested
2. Make the concepts page more concise
3. Move "troubleshooting" type examples into a page under Resources section

[dougiesquire]

@dougiesquire Is it okay if Paola starts to work on this in her next PR which you can then review/update?

Yes, of course! Sorry for letting down the team