feature/boss-sprites-and-badges (#22)

Reviewed-on: TheFurya/nuzlocke-tracker#22
Co-authored-by: Julian Tabel <juliantabel.jt@gmail.com>
Co-committed-by: Julian Tabel <juliantabel.jt@gmail.com>

backend/src/app/seeds/data/scarlet-bosses.json

@@ -276,7 +276,7 @@
     "after_route_name": null,
     "location": "South Province (Area Three)",
     "section": "Path of Legends",
-    "sprite_url": "/boss-sprites/scarlet/stony-cliff-titan.png",
+    "sprite_url": "/sprites/950.webp",
     "pokemon": []
   },
   {
@@ -290,7 +290,7 @@
     "after_route_name": null,
     "location": "West Province (Area One)",
     "section": "Path of Legends",
-    "sprite_url": "/boss-sprites/scarlet/open-sky-titan.png",
+    "sprite_url": "/sprites/962.webp",
     "pokemon": []
   },
   {
@@ -304,7 +304,7 @@
     "after_route_name": null,
     "location": "East Province (Area Three)",
     "section": "Path of Legends",
-    "sprite_url": "/boss-sprites/scarlet/lurking-steel-titan.png",
+    "sprite_url": "/sprites/968.webp",
     "pokemon": []
   },
   {
@@ -318,7 +318,7 @@
     "after_route_name": null,
     "location": "Asado Desert",
     "section": "Path of Legends",
-    "sprite_url": "/boss-sprites/scarlet/quaking-earth-titan.png",
+    "sprite_url": "/sprites/984.webp",
     "pokemon": []
   },
   {
@@ -332,7 +332,7 @@
     "after_route_name": null,
     "location": "Casseroya Lake",
     "section": "Path of Legends",
-    "sprite_url": "/boss-sprites/scarlet/false-dragon-titan.png",
+    "sprite_url": "/sprites/977.webp",
     "pokemon": []
   }
 ]