refactor: rename app from ncdiscordhook to nc_bot_webhooks

- Update namespace from OCA\NCdiscordhook to OCA\Ncbotwebhooks
- Update app ID, name, and namespace in appinfo/info.xml
- Update composer.json and autoload files
- Update CLI command names from ncdiscordhook:* to nc_bot_webhooks:*
- Update image directory name to nc_bot_webhooks-images
- Update documentation in README.md and INSTALL.md
- Update JavaScript APP_ID and navigation provider paths
- Update admin settings and controller app references

js/settings.js

@@ -1,5 +1,5 @@
 document.addEventListener('DOMContentLoaded', function () {
-    const APP_ID = 'ncdiscordhook';
+    const APP_ID = 'nc_bot_webhooks';
 
     // Read config passed via data attributes on the page
     function parseData(el, key) {