Delete obsolete HF files

codeHF/README.md

@@ -51,7 +51,3 @@ bash runtest.sh
 Running all the steps with `INPUT_CASE=2` takes about 40 seconds in total.
 
 The postprocessing step produces several plots `comparison_histos_(...).pdf`, `MC_(...).pdf`.
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-To confirm that the output of the default settings looks as expected, compare the produced plots with their reference counterparts `(...)_ref.pdf`.
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-The complete list of commit hashes used to produce the reference plots can be found in `versions_ref.txt`.