docs: split configuration reference into per-area pages

docs/reference/configuration/example.md

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+# A complete annotated example
+
+The following config sets a handful of common keys. Every key not shown keeps its default.
+
+```yaml title="unshackle.yaml"
+directories:
+  downloads: ~/Media/unshackle
+  temp: /mnt/scratch/unshackle
+
+network:
+  browser: Chrome131
+
+headers:
+  Accept-Language: en-US,en;q=0.9
+
+cdm:
+  default: chromecdm_l3
+  EXAMPLE2: android_l1
+
+decryption: shaka
+
+credentials:
+  EXAMPLE2: user@example.com:hunter2
+
+output_template:
+  movies: "{title}.{year}.{quality?}.{source}-{tag}"
+  series: "{title}.{season_episode}.{quality?}.{source}-{tag}"
+  folder:
+    movies: "{title} ({year})"
+    series: "{title} ({year})"
+
+tag: MYGRP
+
+key_vaults:
+  - type: SQLite
+    name: Local
+    path: ~/.unshackle/keys.db
+
+proxy_providers:
+  basic:
+    us: http://user:pass@1.2.3.4:8080
+
+omdb_api_key: "your-omdb-key"
+tmdb_api_key: "your-tmdb-key"
+tvdb_api_key: "your-tvdb-key"
+title_cache_time: 3600
+redact_paths: true
+```
+
+For how these interact at runtime, continue to [Downloading](../../guide/downloading.md),
+[DRM & CDM](../../guide/drm-and-cdm.md), and [Output & naming](../../guide/output-and-naming.md).