Merge branch 'rf/practicals' into 'master'

advanced_topics/08_fslpy.md

getting_started/01_basics.ipynb

getting_started/01_basics.md

getting_started/02_text_io.ipynb

getting_started/02_text_io.md

getting_started/03_file_management.ipynb

getting_started/03_file_management.md

getting_started/04_numpy.ipynb

getting_started/04_numpy.md

getting_started/05_nifti.ipynb

getting_started/05_nifti.md

getting_started/06_plotting.ipynb

getting_started/06_plotting.md

getting_started/07_jupyter.ipynb

getting_started/07_jupyter.md

getting_started/08_scripts.ipynb

getting_started/08_scripts.md

getting_started/09_pandas.ipynb

getting_started/09_pandas.md