Fix: astropy landing should use labels vs partners

[lwasser]

closes #575

This is just a tiny fix to make sure we're grabbing affiliated data from an editor curated field

[pllim]

When I am previewing https://output.circle-artifacts.com/output/job/5646506d-b78e-4155-a44d-dd3788affb54/artifacts/0/_site/python-packages.html and click the Astropy button, I see this:

https://output.circle-artifacts.com/communities/astropy.html

{"message":"Route Not Found"}

Is this expected?

[lwasser]

@pllim yes - it's a circle CI think i figured out how to fix it - you have to force relative paths. the working path is this:

https://output.circle-artifacts.com/output/job/5646506d-b78e-4155-a44d-dd3788affb54/artifacts/0/_site/communities/astropy.html

it's a quirk that is specific to circleCI / CI rendering outputs where you have to tell jekyll to create the path. I haven't gone through the entire site to fix it yet :( but it's only a ci issue the live site will be fine.