Remove firewall feature (#996)

https://github.com/EFForg/rayhunter/pull/888 contained an entire set of
iptables rules to ensure that no traffic leaked.

We know that many of these devices are fairly insecure, that's how we
get rayhunter installed on most of them. But if an attacker already is
able to run commands on this device, they are most likely going to be
able to run iptables -F too. We should discuss real threatmodels before
adding stuff like this, because messing with iptables also just makes
accidental bricking more likely (see the moxee disk space fiasco)

doc/configuration.md

@@ -51,10 +51,6 @@ You can also configure WiFi during installation:
 ./installer orbic --admin-password 'mypassword' --wifi-ssid 'MyNetwork' --wifi-password 'networkpass'
 ```
 
-## Device Security
-
-- **Restrict outbound traffic** limits what the device can send over the network. When enabled, only DNS, DHCP, and HTTPS traffic is allowed; everything else is blocked. This is enabled by default and prevents the device from phoning home to the carrier over cellular. If you need to allow additional ports (for example, port 80 for HTTP or port 22 for SSH), add them to the **Additional allowed ports** list.
-
 ## WebDAV Upload
 
 Rayhunter can automatically upload finished recordings to a WebDAV server. When a `[webdav]` section is present in `config.toml`, a background worker periodically scans the recording store and uploads any closed entry that is older than `min_age_secs`. Each eligible entry uploads two files: the raw `.qmdl` capture and its `.ndjson` analysis output. After a successful upload the entry is either marked as uploaded in the manifest (and skipped on subsequent polls), or deleted locally if `delete_on_upload = true`. With no `[webdav]` section, no upload worker runs.