Move snippets outside of markdown

Signed-off-by: Helder Correia <174525+helderco@users.noreply.github.com>

docs/tests/core-concepts/client/plans/fs.cue

@@ -0,0 +1,15 @@
+dagger.#Plan & {
+	// Path may be absolute, or relative to current working directory
+	client: filesystem: ".": read: {
+		// CUE type defines expected content
+		contents: dagger.#FS
+		exclude: ["node_modules"]
+	}
+
+	actions: {
+		copy: docker.Copy & {
+			contents: client.filesystem.".".read.contents
+		}
+		// ...
+	}
+}