Try having images under src/ for relative path

package.json

@@ -2,6 +2,7 @@
   "name": "talent-calculator",
   "version": "0.1.0",
   "private": true,
+  "homepage": "https://mirague.github.io/wow-talent-calculator",
   "dependencies": {
     "@types/jest": "24.0.15",
     "@types/node": "12.6.2",
@@ -21,7 +22,9 @@
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
-    "eject": "react-scripts eject"
+    "eject": "react-scripts eject",
+    "predeploy": "yarn run build",
+    "deploy": "gh-pages -d build"
   },
   "eslintConfig": {
     "extends": "react-app"
@@ -39,6 +42,7 @@
     ]
   },
   "devDependencies": {
+    "gh-pages": "^2.0.1",
     "@welldone-software/why-did-you-render": "^3.2.1"
   }
 }