update to 0.1.5

[jgieseler]

• move functionality to the solarmach pypi package, here only the Streamlit code remains
• update functionality to solarmach 0.1.5:
  • Added option to change between Carrington and Stonyhurst coordinates for the whole tool (deprecates overplotting of Earth-centered coordinate system)
  • Added option to change Earth position in the plot
  • Take into account solar differential rotation wrt. latitude (see #21) Instead of spherical radius, plot its projection to the heliographic equatorial plane (see #3)