Added documentation for the numbus-server

docs/numbus-server/configuration/index.md

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+# Documentation
+
+## ✏️ Filling the configuration file
+
+You can deploy the numbus-server without using a configuration file, **but I would strongly advise it** as it diminishes the risk of **typos** when providing credentials. It also creates a file that you can **keep**, **reuse**, **consult** whenever you are **in doubt** about a certain setting.
+
+> 🚀 Let's fill this configuration file !
+
+The configuration file is divided into **multiple categories**. Some of them are **optional**, some are **mandatory**. Here is the list of categories :
+
+| Category | Available variables |
+| -------- | ------------------  |
+| [Live target settings](./live_target.md) | 2 |
+| [Server settings](/.server.md) | 7 |
+| [Mail settings](./mail.md) | 4 |
+| [Traefik settings](./automatic_ssl_certs.md) | 1 |
+| [Network settings](./network.md) | 3 |
+| [Services selection](./services/index.md) | 5 |
+| [Script settings](./script.md) | 1 |