Update sites.json

[amillssma]

Added Sub-millimeter Array (SMA) on Mauna Kea, Hawaii to sites

Description

This pull request is to address ...

Fixes #

[hamogu]

Hi @amillssma!
Thanks for contributing to the list and making it more complete for everyone. I'm not a radio astronomer and I don't actually know how the "location of an array" is defined for arrays that consist of several different dishes.
All I can do it to check on google and see if there is actually a telescope at the location given: https://www.google.com/maps/@19.8248372,-155.4724211,537m/data=!3m1!1e3

It's definitely the right mountain, but I don't see a dish at that location in the middle of the screen. Again, that's probably OK, I just want to ask you to double-check one more time before I merge this that there are no typos in the coordinates! Can you just comment and let me know? Then I'm ready to merge this!

[dhomeier]

@hamogu there seems to be a typo in your lat/lon, or an inconsistency with Google coordinates – OpenStreetmap actually displays this centred right on the control building, with (some configurations of) the array actually visible to the NW.

[amillssma]

Hi, thanks for checking that! You're right, that GPS must be in the control building, I didn't bother to check. The reference antenna would be a better lat/long, and I've been informed the elevation of the control building should be close enough. I'll make those changes. Thanks again!