refactor: Improve code readability and performance in app.py

app.py

@@ -12,12 +12,12 @@ st.title("Fan Control Panel")
 # Description and context
 st.markdown(
     """
-This application accesses a public test demo of a fan controlled by a Pico W
-microcontroller via an EMC2101 fan controller. Send speed commands to the motor
-and visualize the RPM data.
+This application accesses a public test demo of a small computer fan (Canakit
+RPi 5 fan) controlled by a Pico W microcontroller via an EMC2101 fan controller.
+Send speed commands to the motor and visualize the RPM data.
 
-For context, see the fan control code
-https://github.com/AccelerationConsortium/ac-training-lab/tree/main/src/ac_training_lab/picow/fan-control
+For context, see the [fan control
+code](https://github.com/AccelerationConsortium/ac-training-lab/tree/main/src/ac_training_lab/picow/fan-control)
 [[permalink](https://github.com/AccelerationConsortium/ac-training-lab/tree/a8b9cad0dc8c162bdff20c0d0fdff2f45c5f0012/src/ac_training_lab/picow/fan-control)]
 . You may also be interested in the Acceleration Consortium's ["Hello World"
 microcourse](https://ac-microcourses.readthedocs.io/en/latest/courses/hello-world/index.html)