Clean up the big useless file generated by Jupiter notebook (doc)

[couet]

Add a rm in the documentation/doxygen Makefile to remove the files (.csv, and dataset) generated jupyter notebooks

sftnight@ep-root-1:/var/www/root/doc/master/notebooks$ du -sh * | grep '^[1-9\.]*M\s*.*'
21M    dataset
1.7M    datasetBkg0
1.5M    datasetBkg1
1.8M    datasetBkg2
15M    df014_CsvDataSource_MuRun2010B_cpp.csv
15M    df014_CsvDataSource_MuRun2010B_py.csv
15M    df015_CsvDataSource_MuRun2010B.csv
24M    df028_SQliteIPLocation.C.nbconvert.ipynb
5.2M    files
4.7M    parallelcoordtrans.svg
14M    th2polyEurope.C.nbconvert.ipynb
5.2M    th2polyUSA.C.nbconvert.ipynb

[Axel-Naumann]

I don't think it's reasonable to have df028_SQliteIPLocation.C.nbconvert.ipynb take 24MB. We should simplify the plot...