Added more examples

.docs/examples/air.md

.docs/examples/covid-19.md

.docs/examples/influenza.md

.docs/examples/music.md

.docs/examples/power.md

.docs/examples/survey.md

.docs/images/logos/umweltbundesamt.png

.docs/images/screenshots/air-notebook.png

.docs/images/screenshots/mfcc-jupyter.png

mkdocs.yml