incus: add page (#14981)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/incus.md

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+# incus
+
+> Modern, secure and powerful system container and virtual machine manager.
+> More information: <https://linuxcontainers.org/incus/docs/main>.
+
+- List all containers and virtual machines (both running and stopped):
+
+`incus list`
+
+- Create a container from an image, with a custom name:
+
+`incus create {{image}} {{container_name}}`
+
+- Start or stop an existing container:
+
+`incus {{start|stop}} {{container_name}}`
+
+- Open a shell inside an already running container:
+
+`incus shell {{container_name}}`
+
+- Remove a stopped container:
+
+`incus delete {{container_name}}`
+
+- Pull an image from an image repository (remote) to local:
+
+`incus copy {{remote}}:{{image}} local:{{custom_image_name}}`
+
+- List all available images in the official `images:` remote:
+
+`incus image list images:`
+
+- List all images already downloaded to the `local:` remote:
+
+`incus image list local:`