docs: update docs for new rootful password setup

Signed-off-by: Luca Di Maio <luca.dimaio1@gmail.com>

docs/README.md

@@ -220,7 +220,9 @@ docker/podman container or a flatpak.
 ⚠️ **BE CAREFUL**:⚠️  if you use docker, or you use podman with the `--root/-r` flag,
 the containers will run as root, so **root inside the rootful container can modify
 system stuff outside the container**,
-if you have security concern for this, **use podman that runs in rootless mode**.
+Be also aware that **In rootful mode, user and root will inherit the host's password**, this will
+ensure at least that the container is not a passwordless gate to root,
+but if you have security concern for this, **use podman that runs in rootless mode**.
 Rootless docker is still not working as intended and will be included in the future
 when it will be complete.
 

docs/posts/run_libvirt_in_distrobox.md

@@ -42,12 +42,8 @@ ssh for it:
 Port 2222" | sudo tee -a /etc/ssh/sshd_config
 :-$ sudo systemctl enable --now sshd
 :-$ sudo systemctl restart sshd
-:~$ sudo su -
-:~# passwd
 ```
 
-Now set a password for root user.
-
 ## Connect from the host
 
 You can now install VirtManager, you can either use a normal (non root) distrobox, and export the app
@@ -67,7 +63,7 @@ Then set it like this:
 Optionally you can set it to autoconnect.
 
 Now you can simply double click the connection to activate it, you'll be prompted
-with a password, insert the one you used in the `passwd` step previously:
+with your password, insert the same password as the host:
 
 ![image](https://user-images.githubusercontent.com/598882/208441932-f561af0b-9c19-45f7-bacc-d690d80b75e1.png)