Remove unused dependencies from VV.

[kieftrav]

Package

• lib-subject-viewers

Describe your changes

Conversation started from Slack and a dependency bump for an unused package. This cleans up the two no-longer-used packages that were used when the VolumetricViewer was under more intensive development.

How to Review

• Tests pass

[coveralls]

coverage: 75.472% (+0.03%) from 75.442%
when pulling 5381fde on vv-unused-dependencies
into ba7abe0 on master.

[goplayoutside3]

@kieftrav when you edited the package.json for lib-subject-viewers, did you run yarn at the front-end-monorepo root? Un-installation of dependencies results in changes to the yarn.lock file, which I don't see in this PR yet.

Another way to do uninstallation is with the yarn remove canvas and yarn remove watch commands in lib-subject-viewers.