update documentation and remove systemd support

docs/CONFIGURATION.md

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+# Configuration
+
+Complete guide for the `manybot.conf` file.
+
+---
+
+## Basic Structure
+
+```bash
+# Comments start with '#'
+
+CLIENT_ID=bot_permanente
+CMD_PREFIX=!
+LANGUAGE=en
+CHATS=[]
+PLUGINS=[]
+```
+
+---
+
+## Options
+
+### CLIENT_ID
+
+Unique identifier for the bot session.
+
+```bash
+CLIENT_ID=my_bot
+```
+
+- **Default:** `bot_permanente`
+- **Usage:** Creates a `session/` folder with this name to store authentication data
+
+### CMD_PREFIX
+
+Character that indicates the start of a command.
+
+```bash
+CMD_PREFIX=!
+```
+
+- **Default:** `!`
+- **Example:** With prefix `!`, the command is `!sticker`. With `.`, it would be `.sticker`.
+
+### LANGUAGE
+
+Bot message language.
+
+```bash
+LANGUAGE=en
+```
+
+- **Default:** `en` (English)
+- **Options:** `en` (English), `pt` (Portuguese), `es` (Spanish)
+- **Note:** If the selected language doesn't exist, the bot will fall back to English
+
+### CHATS
+
+List of chat IDs where the bot will respond.
+
+```bash
+CHATS=[
+    123456789@c.us,      # Private chat
+    123456789@g.us       # Group
+]
+```
+
+- **Default:** `[]` (empty = responds to all)
+- **Format:**
+  - Private: `NUMBER@c.us`
+  - Group: `NUMBER@g.us`
+
+#### How to discover the ID
+
+```bash
+node src/utils/get_id.js
+```
+
+Scan the QR Code and send a message in the chat. The ID will appear in the terminal.
+
+> Note: The utility uses a separate `CLIENT_ID` to avoid conflicting with the main session.
+
+### PLUGINS
+
+List of plugins to be loaded.
+
+```bash
+PLUGINS=[
+    video,
+    audio,
+    sticker,
+    guess,
+    hangman,
+    many,
+    thanks
+]
+```
+
+- **Default:** `[]` (none)
+- Each name corresponds to a folder in `src/plugins/`
+- Remove or comment to disable without deleting
+
+---
+
+## Custom Settings
+
+You can add your own variables for plugins:
+
+```bash
+# manybot.conf
+MY_PREFIX=>
+API_KEY=my_key
+```
+
+And access in the plugin code:
+
+```javascript
+import { MY_PREFIX, API_KEY } from "../../config.js";
+```
+
+---
+
+## Complete Example
+
+```bash
+# ManyBot Configuration
+
+CLIENT_ID=my_bot_prod
+CMD_PREFIX=/
+LANGUAGE=en
+
+CHATS=[
+    5511999999999@c.us,
+    5511888888888-123456789@g.us
+]
+
+PLUGINS=[
+    sticker,
+    video,
+    audio,
+    many
+]
+
+# Extra settings
+ADMIN_NUMBER=5511999999999@c.us
+```