Major updates, mostly for final project

content/01_final_project.md

content/01_final_project_idea.md

content/06_cnc_machining.md

content/13_networking.md

content/14_wildcard.md

static/audio/14_interface_test.mp3

static/designs/01_enclosure.f3z

static/img/01_coil_winding_setup.jpg

static/img/01_enclosure.jpg

static/img/01_pickup_v1.jpg

static/img/01_samd51_boards.jpg

static/img/06_after.jpg

static/img/14_audio_device.png