Issue #1587: Fixes a bug in the JSON API for jobs

[exoticDFT]

With the current jobs.yml, we are missing a , after our last job object in our generated JSON at https://us-rse.org/api/jobs.json.

Description

The JSON API for the jobs occasionally misses a , after our last jobs object due the to way we sort. It seems to happen if the last non-expired job in our jobs.yml has a posted date that is earlier than other jobs that are not expired. This should fix #1587 by enforcing a , at the end of every object in the JSON and ending the array with an empty object i.e. {}.

• Adds a , for every element in our jobs array
• Updates formatting to see the liquid logic more clearly
• Moves nowunix capture outside of the for loop for jobs

Checklist:

• [x] I have previewed changes locally or with CircleCI (runs when PR is created)
• [x] I have completed any content reviews, such as getting input from relevant working groups. If no, please note this and wait to post the PR to the #website channel until the content has been settled.

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