Demo/repro for babashka/fs#111
See the repl.s3 namespace for using the S3 Paths.
It shows how ginoco.fs/path fails to extend an existing S3 path.
The examples use our ginoco.fs namespace, an extremely minimal NIO.2 wrapper.
It's only included to show how little wrapping was satisfactory for our use-case
of reading some template Excel files from S3, modifying some sheets in them,
then uploading the resulting workbook back to S3 into some other bucket for
later download.
See the repl.jimfs namespace for ginoco.fs/path incompatibility with the
in-memory Jimfs.