Replace UAVCAN with OpenCyphal. (#56)

* This includes the logo and links to renamed UAVCAN website and github organisation.
* 107-Arduino-UAVCAN keeps its name for now, since it will take a little while to adapt this library.

README.md

@@ -1,4 +1,4 @@
-<a href="https://uavcan.org/"><img align="right" src="https://raw.githubusercontent.com/107-systems/.github/main/logo/uavcan.svg" width="20%"></a>
+<a href="https://opencyphal.org/"><img align="right" src="https://raw.githubusercontent.com/107-systems/.github/main/logo/opencyphal.svg" width="25%"></a>
 `107-Arduino-MCP2515`
 =====================
 [![Arduino Library Badge](https://www.ardu-badge.com/badge/107-Arduino-MCP2515.svg?)](https://www.ardu-badge.com/107-Arduino-MCP2515)
@@ -12,7 +12,7 @@
   <a href="https://github.com/107-systems/107-Arduino-DroneCore"><img src="https://github.com/107-systems/.github/raw/main/logo/viper.jpg" width="40%"></a>
 </p>
 
-Arduino library for controlling the MCP2515 in order to receive/transmit CAN frames. This library is prepared to interface easily with [libcanard](https://github.com/UAVCAN/libcanard) for using [UAVCAN](https://uavcan.org/) on Arduino via [107-Arduino-UAVCAN](https://github.com/107-systems/107-Arduino-UAVCAN).
+Arduino library for controlling the MCP2515 in order to receive/transmit CAN frames. This library is prepared to interface easily with [libcanard](https://github.com/OpenCyphal/libcanard) for using [OpenCyphal](https://opencyphal.org/) on Arduino via [107-Arduino-UAVCAN](https://github.com/107-systems/107-Arduino-UAVCAN).
 
 This library works for
 * [ArduinoCore-samd](https://github.com/arduino/ArduinoCore-samd): [`Arduino Zero`](https://store.arduino.cc/arduino-zero), [`MKR 1000`](https://store.arduino.cc/arduino-mkr1000-wifi), [`MKR WiFi 1010`](https://store.arduino.cc/arduino-mkr-wifi-1010), [`Nano 33 IoT`](https://store.arduino.cc/arduino-nano-33-iot), [`MKR GSM 1400`](https://store.arduino.cc/arduino-mkr-gsm-1400-1415), [`MKR NB 1500`](https://store.arduino.cc/arduino-mkr-nb-1500-1413), [`MKR WAN 1300/1310`](https://store.arduino.cc/mkr-wan-1310) :heavy_check_mark: