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

composer/autoload_psr4.php

@@ -6,5 +6,5 @@ $vendorDir = '';
 $baseDir = dirname(__DIR__);
 
 return [
-    'OCA\\NCdiscordhook\\' => [$baseDir . '/lib'],
+    'OCA\\Ncbotwebhooks\\' => [$baseDir . '/lib'],
 ];