docs(no-os): simpler and more complete

- Remind user to connect to WiFi.
- Remove the IP section. Just connect to localhost and it will work always.
- Remind to add experimental features to CLI.
- Add `--build-on remote`, or most likely the live system will run out of disk space (which is actually RAM at that moment).

@moduon MT-9339

Author: yajo

docs/howtos/no-os.md

@@ -18,53 +18,21 @@ If an installer is detected, `nixos-anywhere` will not attempt to `kexec` into
 its own image. This is particularly useful for targets that don't have enough
 RAM for `kexec` or don't support `kexec`.
 
+Often you will need some kind of network connectivity before installing NixOS.
+Use the live system to connect to some network.
+
 NixOS starts an SSH server on the installer by default, but you need to set a
 password in order to access it. To set a password for the `nixos` user, run the
 following command in a terminal on the NixOS machine:
 
-```
+```shell
 passwd
 ```
 
-If you don't know the IP address of the installer on your network, you can find
-it by running the following command:
-
-```
-$ ip addr
-1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
-    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
-    inet 127.0.0.1/8 scope host lo
-       valid_lft forever preferred_lft forever
-    inet6 ::1/128 scope host
-       valid_lft forever preferred_lft forever
-2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
-    link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
-    altname enp0s3
-    altname ens3
-    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic noprefixroute eth0
-       valid_lft 86385sec preferred_lft 75585sec
-    inet6 fec0::5054:ff:fe12:3456/64 scope site dynamic mngtmpaddr noprefixroute
-       valid_lft 86385sec preferred_lft 14385sec
-    inet6 fe80::5054:ff:fe12:3456/64 scope link
-       valid_lft forever preferred_lft forever
-```
-
-This will display the IP addresses assigned to your network interface(s),
-including the IP address of the installer. In the example output below, the
-installer's IP addresses are `10.0.2.15`, `fec0::5054:ff:fe12:3456`, and
-`fe80::5054:ff:fe12:3456%eth0`:
+You can then run `nixos-anywhere` like this:
 
-To test if you can connect and your password works, you can use the following
-SSH command (replace the IP address with your own):
-
-```
-ssh -v nixos@fec0::5054:ff:fe12:3456
-```
-
-You can then use the IP address to run `nixos-anywhere` like this:
-
-```
-nix run github:nix-community/nixos-anywhere -- --flake '.#myconfig' --target-host nixos@fec0::5054:ff:fe12:3456
+```shell
+nix --extra-experimental-features 'nix-command flakes' run github:nix-community/nixos-anywhere -- --flake '.#myconfig' --target-host nixos@localhost --build-on remote
 ```
 
 This example assumes a flake in the current directory containing a configuration