Update supported OSes (add Alma Linux, RPi OS 11, drop EOL OSes) (#5440)

* Drop Fedora 33

By the time we release, it's going to reach EOL.

* Drop Raspberry Pi OS 10, add support for 11

* Bring RPi OS 10 back

* Add Alma Linux 8

* Fix-up RHEL EOL dates

* Add '(Legacy)' to Raspberry Pi OS 10

* Drop CentOS 8

docs/install_guides/raspberry-pi-os-11.rst

@@ -0,0 +1,40 @@
+.. _install-raspberry-pi-os-11:
+
+=============================================
+Installing Red on Raspberry Pi OS 11 Bullseye
+=============================================
+
+.. note::
+
+    This guide can only be used with Raspberry Pi OS 11 Bullseye,
+    it will not work with any older (e.g. Raspberry Pi OS 10 Buster)
+    or newer (e.g. Raspberry Pi OS 12 Bookworm) releases.
+    You can check your version of Raspberry Pi OS by running:
+
+    .. prompt:: bash
+
+        lsb_release -a
+
+    If you're not running Bullseye, you should read
+    `the post about Bullseye release from Raspberry Pi Foundation <https://www.raspberrypi.com/news/raspberry-pi-os-debian-bullseye/>`__
+    to learn how you can install/upgrade to the new version.
+
+.. include:: _includes/linux-preamble.rst
+
+-------------------------------
+Installing the pre-requirements
+-------------------------------
+
+Raspberry Pi OS "Bullseye" has all required packages available in official repositories. Install them
+with apt:
+
+.. prompt:: bash
+
+    sudo apt update
+    sudo apt -y install python3 python3-dev python3-venv python3-pip git openjdk-11-jre-headless build-essential nano
+
+.. Include common instructions:
+
+.. include:: _includes/create-env-with-venv.rst
+
+.. include:: _includes/install-and-setup-red-unix.rst