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/cloud-init/files-from-guard/README.md

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+# Files for the file server
+
+first-boot.sh downloads from **`.../files/first-boot/`** (e.g. `http://10.130.60.141:5000/files/first-boot`). Put all first-boot assets in a **first-boot** subfolder of portal-files so provisioning works.
+
+## Required files (host under `.../files/first-boot/`)
+
+| File | Purpose |
+|------|--------|
+| **start-chromium.sh** | Chromium kiosk launcher (executable). |
+| **chromium-kiosk.desktop** | Autostart entry for the kiosk. |
+| **splash.png** | Boot splash + login + desktop wallpaper (single image). |
+| **custom.plymouth** | Plymouth theme config (from `plymouth-custom/`). |
+| **custom.script** | Plymouth script that displays splash.png (from `plymouth-custom/`). |
+| **99-wallpaper.conf** | LightDM greeter wallpaper (from `config-files/`). |
+| **99-default-session.conf** | LightDM default session rpd-labwc (from `config-files/`). |
+| **maliit-keyboard.desktop** | Maliit on-screen keyboard autostart (from `config-files/`). |
+| **set-rotation-once.sh** + **.desktop** | One-shot: wlr-randr rotation (Left) at first login. |
+
+Desktop wallpaper is set once during first-boot via pcmanfm config (first-boot.sh); no set-wallpaper-once one-shot needed.
+
+---
+
+## What’s in this folder
+
+- **plymouth-custom/splash.png** — Example splash image; host as `splash.png`.
+- **plymouth-custom/custom.plymouth** — Plymouth theme definition; host as `custom.plymouth`.
+- **plymouth-custom/custom.script** — Plymouth script that draws splash.png; host as `custom.script`.
+- **lightdm/RPiSystem_dark.png** — Unused; only `splash.png` is used now.
+- **start-chromium.sh** and **chromium-kiosk.desktop** live in `cloud-init/` and `cloud-init/config-files/`; `scripts/sync-portal-files-to-lxc.sh` copies them to the portal first-boot folder.
+- **set-rotation-once.sh** (and its .desktop) are in `cloud-init/` and synced to `portal-files/first-boot/` by the same script.

emmc-provisioning/cloud-init/files-from-guard/plymouth-custom/custom.plymouth

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+[Plymouth Theme]
+Name=Custom Splash
+Description=Custom boot splash screen
+ModuleName=script
+
+[script]
+ImageDir=/usr/share/plymouth/themes/custom
+ScriptFile=/usr/share/plymouth/themes/custom/custom.script

emmc-provisioning/cloud-init/files-from-guard/plymouth-custom/custom.script

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+screen_width = Window.GetWidth();
+screen_height = Window.GetHeight();
+
+theme_image = Image("splash.png");
+image_width = theme_image.GetWidth();
+image_height = theme_image.GetHeight();
+
+scale_x = image_width / screen_width;
+scale_y = image_height / screen_height;
+
+if (scale_x > 1 || scale_y > 1)
+{
+    if (scale_x > scale_y)
+    {
+        resized_image = theme_image.Scale(screen_width, image_height / scale_x);
+        image_x = 0;
+        image_y = (screen_height - ((image_height * screen_width) / image_width)) / 2;
+    }
+    else
+    {
+        resized_image = theme_image.Scale(image_width / scale_y, screen_height);
+        image_x = (screen_width - ((image_width * screen_height) / image_height)) / 2;
+        image_y = 0;
+    }
+}
+else
+{
+    resized_image = theme_image.Scale(image_width, image_height);
+    image_x = (screen_width - image_width) / 2;
+    image_y = (screen_height - image_height) / 2;
+}
+
+if (Plymouth.GetMode() != "shutdown")
+{
+    sprite = Sprite(resized_image);
+    sprite.SetPosition(image_x, image_y, -100);
+}
+
+fun message_callback(text) {
+}