docs: add generated CLI help output to repo (#46)

Generate the help pages using `cobras` builtin functionality and commit
them to the repository. This gives users to ability to review the
options of `hcloud-upload-image` without having to install it first.

docs/cli/hcloud-upload-image.md

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+## hcloud-upload-image
+
+Manage custom OS images on Hetzner Cloud.
+
+### Synopsis
+
+Manage custom OS images on Hetzner Cloud.
+
+### Options
+
+```
+  -h, --help            help for hcloud-upload-image
+  -v, --verbose count   verbose debug output, can be specified up to 2 times
+```
+
+### SEE ALSO
+
+* [hcloud-upload-image cleanup](hcloud-upload-image_cleanup.md)	 - Remove any temporary resources that were left over
+* [hcloud-upload-image upload](hcloud-upload-image_upload.md)	 - Upload the specified disk image into your Hetzner Cloud project.
+

docs/cli/hcloud-upload-image_cleanup.md

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+## hcloud-upload-image cleanup
+
+Remove any temporary resources that were left over
+
+### Synopsis
+
+If the upload fails at any point, there might still exist a server or
+ssh key in your Hetzner Cloud project. This command cleans up any resources
+that match the label "apricote.de/created-by=hcloud-upload-image".
+
+If you want to see a preview of what would be removed, you can use the official hcloud CLI and run:
+
+    $ hcloud server list -l apricote.de/created-by=hcloud-upload-image
+    $ hcloud ssh-key list -l apricote.de/created-by=hcloud-upload-image
+
+This command does not handle any parallel executions of hcloud-upload-image
+and will remove in-use resources if called at the same time.
+
+```
+hcloud-upload-image cleanup [flags]
+```
+
+### Options
+
+```
+  -h, --help   help for cleanup
+```
+
+### Options inherited from parent commands
+
+```
+  -v, --verbose count   verbose debug output, can be specified up to 2 times
+```
+
+### SEE ALSO
+
+* [hcloud-upload-image](hcloud-upload-image.md)	 - Manage custom OS images on Hetzner Cloud.
+

docs/cli/hcloud-upload-image_upload.md

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+## hcloud-upload-image upload
+
+Upload the specified disk image into your Hetzner Cloud project.
+
+### Synopsis
+
+This command implements a fake "upload", by going through a real server and snapshots.
+This does cost a bit of money for the server.
+
+```
+hcloud-upload-image upload (--image-path=<local-path> | --image-url=<url>) --architecture=<x86|arm> [flags]
+```
+
+### Examples
+
+```
+  hcloud-upload-image upload --image-path /home/you/images/custom-linux-image-x86.bz2 --architecture x86 --compression bz2 --description "My super duper custom linux"
+  hcloud-upload-image upload --image-url https://examples.com/image-arm.raw --architecture arm --labels foo=bar,version=latest
+```
+
+### Options
+
+```
+      --architecture string     CPU architecture of the disk image [choices: x86, arm]
+      --compression string      Type of compression that was used on the disk image [choices: bz2, xz]
+      --description string      Description for the resulting image
+  -h, --help                    help for upload
+      --image-path string       Local path to the disk image that should be uploaded
+      --image-url string        Remote URL of the disk image that should be uploaded
+      --labels stringToString   Labels for the resulting image (default [])
+      --server-type string      Explicitly use this server type to generate the image. Mutually exclusive with --architecture.
+```
+
+### Options inherited from parent commands
+
+```
+  -v, --verbose count   verbose debug output, can be specified up to 2 times
+```
+
+### SEE ALSO
+
+* [hcloud-upload-image](hcloud-upload-image.md)	 - Manage custom OS images on Hetzner Cloud.
+