Update Makefile

make clean should also remove the venv (see Update venv and clean make targets #856)
make clean-venv should be added to only remove the venv (see Update venv and clean make targets #856)
make check should check for the default role (see Use sphinx-lint in make check. #866)
make htmlview should be added (see bpo-36329: Replace 'make serve' with 'make htmlview' #826)
make venv shouldn't print when called by other targets (see Only print make venv message when needed. #867)

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