Timeout on doc build in CircleCI

[lesteve]

https://app.circleci.com/pipelines/github/joblib/joblib/385/workflows/c6781732-96fb-488d-aa07-3d9438c03c92/jobs/1639

First look at it seems to indicate that:

• examples/compressors_comparison.py is to blame
• the dataset download is to blame but I am not 100% sure ... certainly rerunning the example locally can take a very variable time 20s to a few minutes locally.

A possible work-around would be to try OpenML https://www.openml.org/d/1113 rather than https://archive.ics.uci.edu/ml/machine-learning-databases/kddcup99-mld/.

Downloading the 10% sampled dataset from OpenML rather than the full dataset from archive.ics.uci.edu and taking the first 1e6 with pandas (data = pd.read_csv(url, names=names, nrows=1e6)) results in a similar sized dataset ~160MB.

[lesteve]

Hmmm I think this was a complete red herring ... it seems like something is fishy on CircleCI the doc build does not finish but it works fine on readthedocs e.g. the build on master from yesterday: https://readthedocs.org/projects/joblib/builds/13869831/

A pragmatic approach would be to drop CircleCI since it does not seem useful anymore, i.e. we can have doc build in PRs with readthedocs.