Adding 7th event, refactored to remove duplication

The duplication was mostly around info about event and the event templates.

Extracted the event and location data into a json file.

Event descriptions in markdown files.
Various adjustments. Separate commit for easier review. Intend to squash.
Moved event meta data from json file into markdown
The two requested adjustments.
Merge location data into event YAML.
* Added max-width on the site to improve readability. 1200px for a multiple column layout and 800px for a single column (events and resources pages)
* Removed unused members page
* Slight update to formatting of 7th event.
Merge branch 'dbernar1-seventh-meetup'

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