cleaner repo structure

classes/Session01-feb18/README.md

classes/Session02-feb25/Lives in Transit and Git.pptx

classes/Session02-feb25/README.md

classes/Session03-mar10/README.md

classes/Session04-mar17/README.md

projects/Henrik's Project/Feeling the Past/README.md

projects/Henrik's Project/Feeling the Past/session-7.md

projects/Henrik's Project/Linux Journey/README.md

projects/Henrik's Project/Linux Journey/journey_henrik.md

projects/Maryam & Manuel's Project/README.md

projects/Patrick's Project/README.md

projects/Ricardo's Project/README.md