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19665: doc: do not rebuild riot.css r=maribu a=maribu
### Contribution description
- simplify the makefile
- changing behavior depending on lessc being installed is surprising and makes the Makefile less readable
- failing with `make: lessc: No such file or directory` is helpful, but `make: No rule to make target 'src/css/riot.css'` is not clearly indicating that `lessc` was not found
- don't rebuild `riot.css` when generating HTML output
- anyone touching the less file will have to manually call `make src/css/riot.css -C doc/doxygen`
- this happens so rarely that implementing a convenient mechanism is not worth the trouble
Co-authored-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de>