Migrate hawkBit documentation to GitHub Pages Initial

Signed-off-by: Denislav Prinov <denislav.prinov@bosch.com>

docs/_coverpage.md

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+<img src="images/hawkbit_logo.png" alt="hawkBit logo" width="420">
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+<!--# Documentation-->
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+# Open‑source software update server for IoT devices.
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+[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=eclipse-hawkbit_hawkbit&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=eclipse-hawkbit_hawkbit)
+[![Maven Central](https://img.shields.io/maven-central/v/org.eclipse.hawkbit/hawkbit-parent?label=maven-central&color=blue)](https://search.maven.org/search?q=g:org.eclipse.hawkbit)
+[![Lines of code](https://img.shields.io/badge/dynamic/xml.svg?label=Lines%20of%20code&url=https%3A%2F%2Fwww.openhub.net%2Fprojects%2Fhawkbit.xml%3Fapi_key%3D30bc3f3fad087c2c5a6a67a8071665ba0fbe3b6236ffbf71b7d20849f4a5e35a&query=%2Fresponse%2Fresult%2Fproject%2Fanalysis%2Ftotal_code_lines&colorB=lightgrey)](https://www.openhub.net/p/hawkbit)
+[![Join the chat at https://gitter.im/eclipse/hawkbit](https://badges.gitter.im/eclipse/hawkbit.svg)](https://gitter.im/eclipse/hawkbit?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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+[Documentation](README)
+[Release notes](release-notes)
+[GitHub](https://github.com/eclipse-hawkbit/hawkbit)
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+![color](#F0EEEA)