Remove namespaced-tldraw/tldraw.css (#3068)

This is a generated file that shouldn't be checked in.

### Change Type
- [x] `internal` — Any other changes that don't affect the published
package[^2]

.gitignore

@@ -51,6 +51,7 @@ api-json
 api-md
 
 packages/tldraw/tldraw.css
+packages/namespaced-tldraw/tldraw.css
 
 packages/assets/embed-icons
 packages/assets/fonts