Rebrand application from 'Beach Litter Mapping Platform' to 'Litter Scouts'

- Updated app name in all source files, documentation, and configuration
- Changed package names in package.json files
- Updated header, titles, and user-facing text
- Modified email templates and notification text
- Updated steering rules and spec documents

package.json

@@ -1,5 +1,5 @@
 {
-  "name": "ocean-cleanup",
+  "name": "litter-scouts",
   "private": true,
   "version": "0.0.0",
   "type": "module",