Add mdbook documentation

docs/ref/Introduction/README.md

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+# Introduction.

docs/ref/Introduction/compatibility.md

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+# Compatibility.

docs/ref/Introduction/description.md

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+# Description.

docs/ref/README.md

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+# Introduction
+
+## Description
+
+## Architecture
+
+## Compatibility

docs/ref/backup-restore.md

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+# Back Up and Restore

docs/ref/configuration/README.md

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+# Configuration

docs/ref/configuration/configuration-files.md

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+# Configuration files

docs/ref/configuration/environment-variables.md

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+# Environment Variables

docs/ref/getting-started/README.md

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+# Getting Started

docs/ref/getting-started/installation.md

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+# Installation

docs/ref/getting-started/requirements.md

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+# Requirements

docs/ref/glossary.md

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+# Glossary

docs/ref/performance.md

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+# Performance

docs/ref/security.md

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+# Security

docs/ref/uninstall.md

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+# Uninstall

docs/ref/upgrade.md

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+# Upgrade