chore: update comments and ReadMe; eliminate more semicolons for consistency

[kswenson]

This started with the simple task of updating the ReadMe with information about the new @concord-consortium/cloud-file-manager library option.

• While at it I decided to add some information about the options that could be passed to the CFM in the ReadMe as well.
• While doing that it seemed like some additional comments about the meaning of some of the options was warranted, although I bailed out before documenting all of them.
• Finally, while looking at the definitions of the various options I was struck by the number of semicolons in this supposedly semicolon-less project and updated the ESLint configuration to make things more consistent.

[dougmartin]

Looks good 👍