chore: fix path to the dashboard README (#1696)

Author: konippi

crates/fig_desktop/README.md

@@ -6,7 +6,7 @@ instructions in the [root README](../README.md).
 
 ## Developing
 
-1. Follow the instructions under [the dashboard README](../packages/dashboard-app/README.md) to run the development server.
+1. Follow the instructions under [the dashboard README](../../packages/dashboard-app/README.md) to run the development server.
 1. Run `cargo run`.
 1. Once the UI opens, right click anywhere to inspect element, go to the console tab, and set `window.location.href`
 to the URL of the dashboard development server.