python 3.8 is getting too old, take older distros out of docs, lxd->incus too

vm/INCUS_README.md

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+# Preparations
+
+    you will need at least 2GB of free disk space to install pan.do/ra
+
+# Installing pan.do/ra inside Incus
+
+1) Install incus on the host (Debian/12 with backports):
+
+    sudo apt install incus
+
+2) Create a new container, use different names if installing multiple instances:
+
+    sudo incus launch images:debian/12 pandora
+
+3) Attach to container and install pan.do/ra
+
+    sudo incus exec pandora bash
+    apt-get update -qq && apt-get upgrade -y
+    apt-get -y install curl ca-certificates
+    echo PasswordAuthentication no >> /etc/ssh/sshd_config
+    locale-gen en_US.UTF-8
+    update-locale LANG=en_US.UTF-8
+    export LANG=en_US.UTF-8
+
+    cd /root
+    curl -sL https://pan.do/ra-install > pandora_install.sh
+    chmod +x pandora_install.sh
+    ./pandora_install.sh 2>&1 | tee pandora_install.log
+