Handbook discrepancy: metadata/<batch> vs metadata/<batch>/platemaps

Having the metadata broken out into platemaps and external is still a relatively new thing, and the image analysis team to date has typically only ever dealt with the platemap level metadata. Thus, on AWS, metadata is stored as `s3://${BUCKET}/projects/${PROJECT_NAME}/workspace/metadata/${BATCH_ID}`, as evidenced in this [sync command](https://github.com/cytomining/profiling-handbook/blob/master/05-create-profiles.md?plain=1#L322).

BUT, for the recipe, we eventually want it in `s3://${BUCKET}/projects/${PROJECT_NAME}/workspace/metadata/platemaps/${BATCH_ID}`, as depicted in [this tree structure](https://github.com/cytomining/profiling-handbook/blob/master/05-create-profiles.md?plain=1#L172-L179). We currently handle that with just adding that extra `platemaps` in during the sync command above.

BUT, that's not what the handbook implies - it implies that it should be uploaded in the tree structure. So we basically have one of a couple of choices - 1) Explain everything I just wrote here in the handbook and show both tree structures there or 2) From now on, change how the analysts structure things and update the sync command, because presumably in places like the gallery in the future (but I don't know that anyone has checked for current bits of metadata over there), we want this new structure.

I'm guessing the preference here is 2, but we should make a decision and update the handbook accordingly.