Add some moar orgs

Updated [the script](https://github.com/github/government.github.com/blob/gh-pages/script/fetch-us#L38-L42) used to vendor the Social Media Registry into `government.github.com` to compare what's not in the registry and should be (or what's in the registry and really shouldn't).

From that I merged it with the existing appended list, sorted, and ensured uniqueness.

FWIW, it may make sense to simply vendor https://government.github.com/organizations.json which is a crowdsourced superset of the Federal Social Media Registry

//cc @gbinal

### Missing from registry:

- @arcticlcc
- @bbginnovate
- @blue-button
- @ca-cst-sii
- @cocomans
- @commercegov
- @cooperhewitt
- @eeoc
- @energyapps
- @fccdata
- @federal-aviation-administration
- @globegit
- @gopleader
- @government-services
- @greatsmokymountainsnationalpark
- @hhsdigitalmediaapiplatform
- @hhsidealab
- @imdprojects
- @innovation-toolkit
- @ioos
- @irsgov
- @jbei
- @kbase
- @m-o-s-e-s
- @nasa-gibs
- @nasa-rdt
- @nasajpl
- @nationalguard
- @ncats
- @ncpp
- @ncrn
- @ndar
- @neogeographytoolkit
- @nersc
- @ngageoint
- @ngds
- @nhanes
- @niem
- @nist-bws
- @nist-ics-sec-tb
- @nistdeepzoom
- @nmml
- @noaa-orr-erd
- @nrel-cookbooks
- @ozone-development
- @pm-master
- @servir
- @smithsonian
- @sunpy
- @usbr
- @usdeptveteransaffairs
- @usgcrp
- @usgin-models
- @usgs-astrogeology
- @usgs-cida
- @usgs-owi
- @usgs-r
- @usindianaffairs
- @usnistgov
- @usps
- @vhainnovations
- @virtual-world-framework
- @visionworkbench
- @wfmrda

### In the registry, but not valid

- @gsa-ocsit
- @imls