j94f05bgq_flt.fits.gz is not pristine

`j94f05bgq_flt.fits.gz` file in this repo used with the FITS tutorial is not pristine. That is, it already has the modifications that were supposed to be added during the tutorial itself. Not a deal breaker but not pretty.

For a future workshop, someone should recover the pristine version, if possible.

Start with j94f05bgq_flt.fits.gz and inspect its history alongside the FITS tutorial materials to identify the intended pre-tutorial version. Done means the workshop repository contains a recoverable pristine version for participants to modify during the tutorial.

Written by the indexing model from the issue text.