datasets are not downloadable anymore

[sassman]

As stated here:

modelfox/crates/tree/benchmarks/README.md

Lines 12 to 18 in 8e7bd80

	mkdir data
	curl -sSL https://datasets.modelfox.dev/allstate_train.csv > data/allstate_train.csv
	curl -sSL https://datasets.modelfox.dev/allstate_test.csv > data/allstate_test.csv
	curl -sSL https://datasets.modelfox.dev/flights_train.csv > data/flights_train.csv
	curl -sSL https://datasets.modelfox.dev/flights_test.csv > data/flights_test.csv
	curl -sSL https://datasets.modelfox.dev/higgs_train.csv > data/higgs_train.csv
	curl -sSL https://datasets.modelfox.dev/higgs_test.csv > data/higgs_test.csv

The subdomain is not there anymore:

curl: (6) Could not resolve host: datasets.modelfox.dev