Refs #11084 Remove unused DgsRemap files

Code/Mantid/docs/source/diagrams/DgsRemapWorkflow.xml

-<mxfile userAgent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.45 Safari/537.36"><diagram>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</diagram></mxfile>
\ No newline at end of file