docs: refactored file and directory structure

Signed-off-by: David Karlsson <david.karlsson@docker.com>

docs/manuals/drivers/docker.md

@@ -0,0 +1,30 @@
+# Docker driver
+
+The Buildx Docker driver is the default driver. It uses the BuildKit server
+components built directly into the Docker engine. The Docker driver requires no
+configuration.
+
+Unlike the other drivers, builders using the Docker driver can't be manually
+created. They're only created automatically from the Docker context.
+
+Images built with the Docker driver are automatically loaded to the local image
+store.
+
+## Synopsis
+
+```console
+# The Docker driver is used by buildx by default
+docker buildx build .
+```
+
+It's not possible to configure which BuildKit version to use, or to pass any
+additional BuildKit parameters to a builder using the Docker driver. The
+BuildKit version and parameters are preset by the Docker engine internally.
+
+If you need additional configuration and flexibility, consider using the
+[Docker container driver](./docker-container.md).
+
+## Further reading
+
+For more information on the Docker driver, see the
+[buildx reference](https://docs.docker.com/engine/reference/commandline/buildx_create/#driver).