site: remove CLI auto-generated docs prior to generate

Otherwise we can leave behind stale generated files from previous
instances of the site configuration.

Do not remove the cache files, because otherwise on a
Preprocessor-No-Write-Cache they will not get added back, a change that
would, ironically, create noise in a commit where we are intending there
to be less noise.

Preprocessor-No-Write-Cache: true
Signed-off-by: Paul Jolly <[email protected]>
Change-Id: Ibb6aeb84da3badbd3e24853eea079b93099d3de1
Dispatch-Trailer: {"type":"trybot","CL":1176750,"patchset":3,"ref":"refs/changes/50/1176750/3","targetBranch":"alpha"}

site.cue

@@ -47,6 +47,13 @@ let donotedit = base.doNotEditMessage & {#generatedBy: "site_tool.cue", _}
 // template is an io/fs.FS-like map of files that are templated
 // by site_tool.cue:gen for the working of cuelang.org
 template: ci.#writefs & {
+	Remove: [
+		// The generated artefacts from the CLI auto-generation. Do not remove
+		// the cache files, because otherwise on a Preprocessor-No-Write-Cache
+		// they will not get added back, a change that would, ironically, create
+		// noise in a commit where we are intending there to be less noise.
+		"content/docs/reference/cli/cue-*/*.md",
+	]
 	Create: {
 		"internal/cmd/preprocessor/cmd/_docker/Dockerfile": {
 			Contents: #"""