[Build] Remove SNAPSHOT status

...to close sprint Niven,
https://github.com/nasa/openmct/milestones/Niven

Tag for VISTA R3B1 Release

[Build] Remove SNAPSHOT Status

To close sprint Le Guin,
https://github.com/nasa/openmct/milestone/14

[Build] Remove SNAPSHOT status

...to close sprint Kress,
https://github.com/nasa/openmct/milestones/Kress

[Build] Remove SNAPSHOT status

To close sprint Huxley,
https://github.com/nasa/openmct/milestones/Huxley

[Build] Remove SNAPSHOT status

...to close sprint https://github.com/nasa/openmct/milestones/Herbert

[Build] Remove snapshot suffix

Closes sprint Heinlein,
https://github.com/nasa/openmct/milestones/Heinlein

[Build] Remove SNAPSHOT status

...to tag end of release Gibson,
https://github.com/nasa/openmct/milestones/Gibson

[Build] Remove snapshot status

...to close sprint Ellison,
https://github.com/nasa/openmctweb/milestones/Ellison

[Build] Add npmignore to allow packing

Add .npmignore to facilitate packing of package with npm pack.