Update installation path on README

[sgiarols]

Installation from git pull needs update;

• python setup.py docs does not build documentation
• python -m pip install -e "muse[dev,docs]": is unclear. Either browse to the correct path with conda (using cd and do python -m pip install -e .[dev] ) or do (python -m pip install -e "muse[dev]" substituting the MUSE package download to muse)
• python -m pip install -e "muse[dev,docs]": give error on docs dependencies
• add zeondo DOI