* Update ui build to use 'admin' folder instead of 'core'
Post release of v0.1.2, ui/core folder has been renamed to ui/admin.
Update ui build scripts to be aware of the path change.
* Update packagespec to reflect "admin" ui folder change
* Add mechanism for bundling UI assets.
The scripts/uigen.sh script will check out the UI repo, build assets,
create a static assets file, and clean up.
The dev Makefile target has been modified to run this script if no
assets file is found. There is also a build-ui target that will
unilaterally update (the dev target only builds if the file isn't found,
but doesn't update).
The handler has been updated to add the default org ID as a header if
the request path is "/".
Co-authored-by: Randall Morey <randall@randallmorey.com>