Fixed notebooks, and folder restructure (#19)

* updated dockerfile and compose

* changed docker-compose and dockerfile to mount source code into src dir.

* refactored filepathing for pa notebook

* file cleanup

* fixed filepaths for 1st notebook

* moved files to src

* Update 1_pas.ipynb

* added test input data

* Update 2_vector.ipynb

* Update 3_enrichment.ipynb

* Update 4_impedance.ipynb

Former-commit-id: eba77c860c2f929dfe8114a60ad2f79ad2489bdd

Author: Riyad-boop