Convert docs to Asciidoc

* Remove all info about ue4-engine
* Remove docs about prebuilt ue4-build-prerequisites
* Format command docs as mapages

CONTRIBUTING.adoc

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+= Guidelines for contributing to ue4-docker
+:icons: font
+:idprefix:
+:idseparator: -
+:source-highlighter: rouge
+:toc:
+
+== Creating issues
+
+When creating an issue to report a bug, please follow the provided issue template.
+Make sure you include the full output of the `ue4-docker info` command in the provided section, as well as the full output of the `ue4-docker build` command and the command line parameters used to invoke the build if you are reporting a problem with building the container images.
+
+If you are creating an issue for a feature request, you can disregard the default issue template.
+However, please make sure you have thoroughly read https://docs.adamrehn.com/ue4-docker/[the documentation] to ensure the requested feature does not already exist before creating an issue.
+
+== Creating pull requests
+
+Before creating a pull request, please ensure sure you have tested your changes on all platforms to which the change applies (Linux / Windows Server / Windows 10 / macOS).
+
+== Autoformatting your changes
+
+ue4-docker uses https://github.com/psf/black[Black] for its code formatting.
+If you are submitting changes, make sure to install and run Black:
+
+* `pip install --user black`
+* `python -m black .` (invoke in repository root)
+* Now your code is properly formatted

README.adoc

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+= Unreal Engine 4 Docker Containers
+
+image:https://raw.githubusercontent.com/adamrehn/ue4-docker/master/resources/images/banner.svg?sanitize=true[Unreal Engine and Docker Logos,align="center"]
+
+*Looking for a place to start?
+Check out the https://unrealcontainers.com/[Unreal Containers community hub] for implementation-agnostic information on using the Unreal Engine inside Docker containers, and then head to the https://docs.adamrehn.com/ue4-docker/[comprehensive ue4-docker documentation] to view details specific to using the ue4-docker project.*
+
+The ue4-docker Python package contains a set of Dockerfiles and accompanying build infrastructure that allows you to build Docker images for Epic Games' https://www.unrealengine.com/[Unreal Engine 4].
+The images also incorporate the infrastructure from https://github.com/adamrehn/ue4cli[ue4cli], https://github.com/adamrehn/conan-ue4cli[conan-ue4cli], and https://github.com/adamrehn/ue4-ci-helpers[ue4-ci-helpers] to facilitate a wide variety of use cases.
+
+Key features include:
+
+* Unreal Engine 4.20.0 and newer is supported.
+* Both Windows containers and Linux containers are supported.
+* Building and packaging UE4 projects is supported.
+* Running automation tests is supported.
+* Running built UE4 projects with offscreen rendering is supported via NVIDIA Docker under Linux.
+
+Resources:
+
+* *Documentation:* https://docs.adamrehn.com/ue4-docker/
+* *GitHub repository:* https://github.com/adamrehn/ue4-docker
+* *Package on PyPI:* https://pypi.org/project/ue4-docker/
+* *Related articles:* https://adamrehn.com/articles/tag/Unreal%20Engine/
+* *Unreal Containers community hub:* https://unrealcontainers.com/
+* *Development channel on the Unreal Containers Community Discord server*: https://discord.gg/46CJg9fyJ9
+
+== Contributing
+
+See the file https://github.com/adamrehn/ue4-docker/blob/master/CONTRIBUTING.md[CONTRIBUTING.md] for guidelines on how to contribute to the development of ue4-docker.
+
+== Legal
+
+Copyright © 2018 - 2022, Adam Rehn.
+Licensed under the MIT License, see the file https://github.com/adamrehn/ue4-docker/blob/master/LICENSE[LICENSE] for details.
+
+Unreal and its logo are Epic Games' trademarks or registered trademarks in the US and elsewhere.
+
+Docker and the Docker logo are trademarks or registered trademarks of Docker in the United States and other countries.