Remove obsolete audio and buzzer control documentation files, including detailed guides and HTML interfaces, to streamline the repository and eliminate redundancy. This cleanup enhances maintainability and focuses on essential resources for the reTerminal DM4 audio and buzzer functionalities.

emmc-provisioning/lxc/README.md

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+# LXC config (network boot: eth1 = LAN, eth0 = WAN)
+
+Config files for the **provisioning LXC** when using **eth1** as a provisioning LAN (DHCP + TFTP for network boot, NAT for internet).
+
+| File | Purpose |
+|------|--------|
+| **dnsmasq-network-boot.conf** | dnsmasq: DHCP + TFTP on eth1 only. Copied to `/etc/dnsmasq.d/` by `scripts/setup-network-boot-on-lxc.sh`. |
+| **nft-nat-lan.conf** | nftables NAT so 10.20.50.0/24 uses eth0 for internet. Applied by the setup script to `/etc/nftables.d/nat-lan.conf`. |
+
+Setup is done by running (from your machine):
+
+```bash
+./emmc-provisioning/scripts/setup-network-boot-on-lxc.sh root@<LXC-IP>
+```
+
+See [../docs/NETWORK-BOOT-LXC.md](../docs/NETWORK-BOOT-LXC.md) for full documentation.

emmc-provisioning/lxc/dnsmasq-network-boot.conf

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+# dnsmasq: DHCP + TFTP on eth1 only (provisioning LAN).
+# Install to /etc/dnsmasq.d/network-boot.conf on the LXC.
+# Restrict to eth1 so we don't interfere with host/other DHCP.
+
+# Listen only on eth1 (provisioning LAN)
+interface=eth1
+bind-interfaces
+
+# DHCP range for devices on eth1 (adjust if you use a different subnet)
+dhcp-range=10.20.50.100,10.20.50.200,12h
+
+# TFTP for Raspberry Pi / CM4 network boot
+enable-tftp
+tftp-root=/srv/tftpboot
+
+# RPi 4 netboot: next-server is this host; boot filename (Pi firmware uses this)
+# Option 66 = next-server (TFTP), 67 = boot filename
+dhcp-option=66,10.20.50.1
+dhcp-option=67,start4cd.elf
+
+# Logging (optional; disable in production if too noisy)
+log-dhcp
+log-queries
+
+# Do not use /etc/resolv.conf or act as DNS if you only want DHCP+TFTP
+port=0

emmc-provisioning/lxc/nft-nat-lan.conf

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+# nftables: NAT for LAN (eth1) so clients use WAN (eth0) for internet.
+# Load with: nft -f /etc/nftables.d/nat-lan.conf
+# Or use the inline rules in setup-network-boot-on-lxc.sh (no separate file dependency).
+
+table ip nat {
+	chain postrouting {
+		type nat hook postrouting priority srcnat; policy accept;
+		ip saddr 10.20.50.0/24 oifname "eth0" masquerade
+	}
+}