Update cheatsheets

docker-image

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# docker image
+
+> Manage Docker images.
+> See also: `docker build`, `docker import`, and `docker pull`.
+> More information: <https://docs.docker.com/engine/reference/commandline/image/>.
+
+- List local Docker images:
+
+`docker image ls`
+
+- Delete unused local Docker images:
+
+`docker image prune`
+
+- Delete all unused images (not just those without a tag):
+
+`docker image prune --all`
+
+- Show the history of a local Docker image:
+
+`docker image history {{image}}`