remove: default_platform toml field (#3108)

packages/cli/README.md

@@ -33,12 +33,6 @@ Note: The CLI will fail to build projects in debug profile. This is currently un
 cargo install --path .
 ```
 
-### Developing The CLI
-It's faster to build the CLI using the `cli-dev` profile when testing changes.
-```shell
-cargo build --profile cli-dev
-```
-
 ## Get started
 
 Use `dx new` to initialize a new Dioxus project.