docs: add stubs for all commands

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/reference/buildx.md

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+# buildx
+
+```
+Usage:  docker buildx [OPTIONS] COMMAND
+
+Build with BuildKit
+
+Options:
+      --builder string   Override the configured builder instance
+
+Management Commands:
+  imagetools  Commands to work on images in registry
+
+Commands:
+  bake        Build from a file
+  build       Start a build
+  create      Create a new builder instance
+  du          Disk usage
+  inspect     Inspect current builder instance
+  ls          List builder instances
+  prune       Remove build cache
+  rm          Remove a builder instance
+  stop        Stop builder instance
+  use         Set the current builder instance
+  version     Show buildx version information
+
+Run 'docker buildx COMMAND --help' for more information on a command.
+```
+
+## Description
+
+Build with BuildKit

docs/reference/buildx_du.md

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+# buildx du
+
+```
+Usage:  docker buildx du
+
+Disk usage
+
+Options:
+      --builder string   Override the configured builder instance
+      --filter filter    Provide filter values
+      --verbose          Provide a more verbose output
+```
+
+## Description
+
+Disk usage

docs/reference/buildx_imagetools.md

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+# buildx imagetools
+
+```
+Usage:  docker buildx imagetools [OPTIONS] COMMAND
+
+Commands to work on images in registry
+
+Options:
+      --builder string   Override the configured builder instance
+
+Commands:
+  create      Create a new image based on source images
+  inspect     Show details of image in the registry
+```
+
+## Description
+
+Imagetools contains commands for working with manifest lists in the registry.
+These commands are useful for inspecting multi-platform build results.

docs/reference/buildx_prune.md

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+# buildx prune
+
+```
+Usage:  docker buildx prune
+
+Remove build cache
+
+Options:
+  -a, --all                  Remove all unused images, not just dangling ones
+      --builder string       Override the configured builder instance
+      --filter filter        Provide filter values (e.g. 'until=24h')
+  -f, --force                Do not prompt for confirmation
+      --keep-storage bytes   Amount of disk space to keep for cache
+      --verbose              Provide a more verbose output
+```
+
+## Description
+
+Remove build cache

docs/reference/buildx_version.md

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+# buildx version
+
+```
+Usage:  docker buildx version
+
+Show buildx version information
+
+Options:
+      --builder string   Override the configured builder instance
+```
+
+## Description
+
+Show buildx version information
+
+## Examples
+
+### View version information
+
+
+```console
+$ docker buildx version
+github.com/docker/buildx v0.5.1-docker 11057da37336192bfc57d81e02359ba7ba848e4a
+```