Remove sensitive files from tracking and add example config

Add matterbridge.toml, test configs, HAR captures, and JWT-containing
debug files to .gitignore. Provide matterbridge.toml.example with
placeholder values for safe onboarding.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -33,6 +33,21 @@ Thumbs.db
 
 # Config files with secrets
 matterbridge.toml.local
+matterbridge.toml
+test-token-config.toml
+*.har
+*.har.txt
+*.har.gz
+auth-data.json
+definitely_logged_*.json
+loggedin_maybe.json
+loggedout_maybe.json
+
+# Debug/capture files with JWT tokens
+QUICK_START_TOKEN.md
+loggedout_websocket_messages.md
+logging_IN_attempt_but_loggedout_websocket_messages.md
+logging_IN_attempt_but_now_logged_IN_websocket_messages.md
 *.secret.toml
 .env