fix links

adc/adc.8E5.board.jpg

adc/adc.8E5.c

adc/adc.8E5.interior.png

adc/adc.8E5.layout.png

adc/adc.8E5.make

adc/adc.8E5.traces.png

adc/adc.h

adc/load-cell-small.mp4

adc/serial.h

dac/hello.8E5.dac.c

dac/hello.8E5.dac.make

dac/make_lookup.py

dac/sine.png

dac/xmega-8e5-dac-board.jpg

dac/xmega-8e5-dac-layout.png

dac/xmega-8e5-dac-outline.png

dac/xmega-8e5-dac-traces.png

i2c/hall-encoder-interior.png

i2c/hall-encoder-layout.png

i2c/hall-encoder-traces.png