Update README

Update maintenance team duties according to latest discussions on dev call.

README.md

@@ -40,7 +40,7 @@ The PX4 Dev Team syncs up on a [weekly dev call](https://dev.px4.io/en/contribut
 
 ## Maintenance Team
 
-  * Project / Founder - [Lorenz Meier](https://github.com/LorenzMeier)
+  * Project: Founder - [Lorenz Meier](https://github.com/LorenzMeier), Architecture: [Daniel Agar](https://github.com/dagar)
     * [Dev Call](https://github.com/PX4/Firmware/labels/devcall) - [Ramon Roche](https://github.com/mrpollo)
   * Communication Architecture
     * [Beat Kueng](https://github.com/bkueng)
@@ -67,15 +67,13 @@ The PX4 Dev Team syncs up on a [weekly dev call](https://dev.px4.io/en/contribut
   * Vision based navigation
     * [Christoph Tobler](https://github.com/ChristophTobler)
     * [Mohammed Kabir](https://github.com/mhkabir)
-  * Obstacle Avoidance - [Vilhjalmur Vilhjalmsson](https://github.com/vilhjalmur89)
+  * Obstacle Avoidance - [Martina Rivizzigno](https://github.com/mrivi)
   * [Snapdragon](https://github.com/PX4/Firmware/labels/snapdragon)
     * [Christoph Tobler](https://github.com/ChristophTobler)
-    * [Mark Charlebois](https://github.com/mcharleb)
   * [Intel Aero](https://github.com/PX4/Firmware/labels/intel%20aero)
     * [Sugnan Prabhu](https://github.com/sugnanprabhu)
     * [José Roberto de Souza](https://github.com/zehortigoza)
   * [Raspberry Pi / Navio](https://github.com/PX4/Firmware/labels/raspberry_pi) - [Beat Kueng](https://github.com/bkueng)
-  * [Parrot Bebop](https://github.com/PX4/Firmware/labels/bebop) - [Michael Schaeuble](https://github.com/eyeam3)
   * [Airmind MindPX / MindRacer](https://github.com/PX4/Firmware/labels/mindpx) - [Henry Zhang](https://github.com/iZhangHui)
   * RTPS/ROS2 Interface - [Vicente Monge](https://github.com/vicenteeprosima)