Reorganize "Fabrication" folder to reflect new versions of sensor
[x] Create folders within Fabrication specific to the Polycase enclosure, PVC enclosure, and old content
[x] Create readme.md file explaining the need for multiple designs and separate folders, plus how to choose the best enclosure option for various applications
[x] Create readme.md files for assembly guides using old instructions
Reorganize "Fabrication" folder to reflect new versions of sensor