Since the output file stays unmodified for most developer builds, install step installed it redundantly. Create readme.html using `configure_file`: - Now it's modified only if final output changes (handled by CMake). - If input file (from git) or blender version changes, it //will// be modified. Also don't re-implement what CMake can do. Reviewed By: campbellbarton, LazyDodo Differential Revision: https://developer.blender.org/D13863