docs: add Ethan's notes

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+* Ethan's Notes
+
+** Pi Camera
+
+sources:
+https://github.com/MichaIng/DietPi/issues/8032#issuecomment-4103452624
+https://vladimir-vinarsky.me/raspberry-pi/ (follow this one to create a service for motion)
+
+#+begin_src bash
+/boot/dietpi/func/dietpi-set_hardware rpi-opengl vc4-kms-v3d
+/boot/dietpi/func/dietpi-set_hardware rpi-codec enable
+G_SUDO G_CONFIG_INJECT 'camera_auto_detect=' 'camera_auto_detect=1' /boot/firmware/config.txt
+sudo reboot
+#+end_src
+
+in `dietpi-config`: turn on pi camera
+
+install these with apt:
+libcamera-tools
+v4l2loopback-dkms
+
+in /etc/motion/motion.conf set:
+stream_motion on
+stream_maxrate 10
+width 1920
+height 1080
+
+** Grafana on FreeBSD
+
+- update pkg so we have the right version
+
+command to run:
+doas grafana server --config=/usr/local/etc/grafana/grafana.ini --homepath /usr/local/share/grafana