fix: update URLs and fix workflow authentication

- Replace pezkuwi.js.org with pezkuwichain.app domain
- Replace jacogr/pezkuwi-js-apps with pezkuwichain/pezkuwi-apps Docker image
- Fix GH_PAT_BOT secret issue by using GITHUB_TOKEN
- Update GitHub org references from pezkuwi-js to pezkuwichain
- Update issue template to point to docs.pezkuwichain.io

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/issue_template.md

@@ -1,9 +1,9 @@
 <!--
 
 For general support, howto, coding and bundling questions, please
-use the Bizinikiwi & Pezkuwi StackExchange at
+visit the Pezkuwi documentation at
 
-  https://bizinikiwi.stackexchange.com/
+  https://docs.pezkuwichain.io/
 
 and get other ecosystem developers involved. This issues in this
 repository are meant for the tracking of feature requests and bug