It will be enabled when the user checks the "manage environments"
permission. This updates the Jinja and Vue checkbox input components so
that Vue can monitor the inpur state.
The environment name will be grayed out until something besides the
default "no access" is selected.
Small changes to the application member subforms:
- filter for "None" as a string
- have nested forms inherit from FlaskForm; each nested form adds its
own validation error flash otherwise if there are validation problems