feat: docs website (#80)

Deploy the documentation to GitHub Pages using `mdbook` and a little
more content for it. Can be visited at https://apricote.github.io/hcloud-upload-image.

docs/.gitignore

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+book
+https:

docs/SUMMARY.md

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+# Summary
+
+[Introduction](introduction.md)
+
+# Guides
+
+- [Uploading Images](guides/README.md)
+  - [Fedora CoreOS ↗](https://docs.fedoraproject.org/en-US/fedora-coreos/provisioning-hetzner/#_creating_a_snapshot)
+  - [Flatcar Container Linux ↗](https://www.flatcar.org/docs/latest/installing/cloud/hetzner/#building-the-snapshots-1)
+  - [Talos Linux ↗](https://www.talos.dev/v1.10/talos-guides/install/cloud-platforms/hetzner/#hcloud-upload-image)
+
+# Reference
+
+- [CLI](reference/cli/hcloud-upload-image.md)
+  - [`upload`](reference/cli/hcloud-upload-image_upload.md)
+  - [`cleanup`](reference/cli/hcloud-upload-image_cleanup.md)
+- [Go Library](reference/go-library.md)
+
+---
+
+[Changelog CLI](changelog.md)
+[Changelog Go Library](changelog-hcloudimages.md)

docs/book.toml

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+[book]
+language = "en"
+multilingual = false
+src = "."
+title = "hcloud-upload-image"
+
+[output.html]
+git-repository-url = "https://github.com/apricote/hcloud-upload-image"

docs/changelog-hcloudimages.md

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+# Changelog Library
+
+{{#include ../hcloudimages/CHANGELOG.md:2: }}

docs/changelog.md

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+# Changelog CLI
+
+{{#include ../CHANGELOG.md:2: }}

docs/guides/README.md

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+# Uploading Images
+
+Check out these docs from other projects to learn how to use `hcloud-upload-image`:
+
+- [Fedora CoreOS ↗](https://docs.fedoraproject.org/en-US/fedora-coreos/provisioning-hetzner/#_creating_a_snapshot)
+- [Flatcar Container Linux ↗](https://www.flatcar.org/docs/latest/installing/cloud/hetzner/#building-the-snapshots-1)
+- [Talos Linux ↗](https://www.talos.dev/v1.10/talos-guides/install/cloud-platforms/hetzner/#hcloud-upload-image)

docs/introduction.md

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+# Introduction
+
+{{#include ../README.md:2:}}

docs/reference/go-library.md

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+# Go Library
+
+You can find the documentation at [pkg.go.dev/github.com/apricote/hcloud-upload-image/hcloudimages ↗](https://pkg.go.dev/github.com/apricote/hcloud-upload-image/hcloudimages).