Remove add action from wf-cli

WriteFreely doesn't support non-auth'd posting like Write.as, so users won't be creating non-auth'd posts with another client that they'd need to add here. Ref T586

Author: thebaer

cmd/wf/main.go

@@ -144,16 +144,6 @@ func main() {
 },
 },
 },
-{
-Name: "add",
-Usage: "Add an existing post locally",
-Description: `A way to add an existing post to your local store for easy editing later.
-
- This requires a post ID (from e.g. https://write.as/[ID]) and an Edit Token
- (exported from another WriteFreely client, such as the Android app).
-`,
-Action: commands.CmdAdd,
-},
 {
 Name: "posts",
 Usage: "List all of your posts",