Update 9 files

- /docs/assignments/week06.md
- /docs/images/week06/alginate1.jpg
- /docs/images/week06/alginate2.jpg
- /docs/images/week06/alginate3.jpg
- /docs/images/week06/biofoam1.jpg
- /docs/images/week06/biofoam2.jpg
- /docs/images/week06/biofoil1.jpg
- /docs/images/week06/biofoil2.jpg
- /docs/images/week06/bioresin.jpg