removing workshops slides

Author: tguyenn

docs/_sections/_guide-primaries/sensors-and-actuators/color-sensors.md

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 # Color Sensor
 The APDS-9960 Color Sensor will allow you to complete the Color Challenge by enabling your robot to see colors!
 
-## Workshop Slides
+<!-- ## Workshop Slides
 <iframe src="https://docs.google.com/presentation/d/1h5p9pCGCKSqfrkFSnQQ6bxtwjZGJe90FrfASYaGZwRY/embed?start=false" 
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docs/_sections/_guide-primaries/sensors-and-actuators/line-sensors.md

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 # Line Sensor
 A necessary component for any challenge that requires your robot to follow a line. This one is the QTR-8A Reflectance Sensor Array and uses IR transmitters and receivers on it to detect lines.
 
-## Workshop Slides
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 <iframe src="https://docs.google.com/presentation/d/1Hs6NceBqnyrwj3lxO_192RLk6LQGkcfpnS2Lv2SEOHE/embed?start=false" 
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 ## How it Works
 The line sensor is made up of an array of 8 IR LED/phototransistor pairs, each take an analog reflectance reading by timing how long it takes the output voltage to decay due to the phototransistor. By pointing the line sensor IR LEDs/phototransistors at the line, the robot is able to tell where the dark line of tape is by reading the output voltage of each phototransistor