- introduce better more stable fallbacks in case the configuration is missing

- move configurations into subfolder for easier discovery
- simplify missing value fallback specification

configs/configuration_complex.json

@@ -0,0 +1,32 @@
+{
+    "categories": [
+        {
+            "title": "## 🚀 Features",
+            "labels": ["feature"]
+        },
+        {
+            "title": "## 🐛 Fixes",
+            "labels": ["fix"]
+        },
+        {
+            "title": "## 🧪 Tests",
+            "labels": ["test"]
+        }
+    ],
+    "sort": "ASC",
+    "template": "${{CHANGELOG}}\n\n<details>\n<summary>Uncategorized</summary>\n\n${{UNCATEGORIZED}}\n</details>",
+    "pr_template": "- ${{TITLE}}\n   - PR: #${{NUMBER}}",
+    "empty_template": "- no changes",
+    "transformers": [
+        {
+            "pattern": "[\\-\\*] (\\[(...|TEST|CI|SKIP)\\])( )?(.+?)\n(.+?[\\-\\*] )(.+)",
+            "target": "- $4\n  - $6"
+        }
+    ],
+    "max_tags_to_fetch": 200,
+    "max_pull_requests": 200,
+    "max_back_track_time_days": 90,
+    "exclude_merge_branches": [
+        "Owner/qa"
+    ]
+}