Update developer dashboard URL to developer.repebble.com

- Point devportal link to new developer.repebble.com/dashboard URL
  now that the Cloudflare Worker proxy is live

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ericmigi

_config.yml

@@ -54,7 +54,7 @@ links:
   pebble: https://rePebble.com
   jobs: https://www.pebble.com/jobs/
   twitter: https://twitter.com/pebble/
-  devportal: https://appstore-api.rePebble.com/dashboard
+  devportal: https://developer.rePebble.com/dashboard
   site_repo: https://github.com/coredevices/sdk-docs
   community_resources_repo: https://github.com/pebble/community-resources/
   github: https://github.com/coredevices/