Changed location of db and config to one unified directory, 'appdata'

Archive files now get generated if nonexistent during deletions

Simplified docker-compose.yml to not require environment variables. Added volume for appdata folder which will be automatically shipped with docker builds

backend/appdata/default.json

@@ -0,0 +1,45 @@
+{
+    "YoutubeDLMaterial": {
+        "Host": {
+            "url": "http://example.com",
+            "port": "17442"
+        },
+      "Encryption": {
+        "use-encryption": false,
+        "cert-file-path": "/etc/letsencrypt/live/example.com/fullchain.pem",
+        "key-file-path": "/etc/letsencrypt/live/example.com/privkey.pem"
+      },
+      "Downloader": {
+        "path-audio": "audio/",
+        "path-video": "video/",
+        "use_youtubedl_archive": false,
+        "custom_args": ""
+      },
+      "Extra": {
+        "title_top": "Youtube Downloader",
+        "file_manager_enabled": true,
+        "allow_quality_select": true,
+        "download_only_mode": false,
+        "allow_multi_download_mode": true
+      },
+      "API": {
+        "use_youtube_API": false,
+        "youtube_API_key": ""
+      },
+      "Themes": {
+        "default_theme": "default",
+        "allow_theme_change": true
+      },
+      "Subscriptions": {
+        "allow_subscriptions": true,
+        "subscriptions_base_path": "subscriptions/",
+        "subscriptions_check_interval": "300",
+        "subscriptions_use_youtubedl_archive": true
+      },
+      "Advanced": {
+        "use_default_downloading_agent": true,
+        "custom_downloading_agent": "",
+        "allow_advanced_download": false
+      }
+    }
+  }