reuse 'usa' images from graphing-lines, phetsims/joist#953, phetsims/…

…graphing-lines#143

graphing-slope-intercept-images.json

@@ -1,9 +1,9 @@
 {
   "usa": {
-    "level1": "images/usaLevel1_svg.ts",
-    "level2": "images/usaLevel2_svg.ts",
-    "level3": "images/usaLevel3_svg.ts",
-    "level4": "images/usaLevel4_svg.ts"
+    "level1": "../graphing-lines/images/usaLevel1_svg.ts",
+    "level2": "../graphing-lines/images/usaLevel3_svg.ts",
+    "level3": "../graphing-lines/images/usaLevel5_svg.ts",
+    "level4": "../graphing-lines/images/usaLevel6_svg.ts"
   },
   "africa": {
     "level1": "images/africaLevel1_svg.ts",

images/license.json

@@ -150,37 +150,5 @@
     "projectURL": "https://phet.colorado.edu",
     "license": "contact phethelp@colorado.edu",
     "notes": "created by Mariah Hermsmeyer"
-  },
-  "usaLevel1.svg": {
-    "text": [
-      "Copyright 2024 University of Colorado Boulder"
-    ],
-    "projectURL": "https://phet.colorado.edu",
-    "license": "contact phethelp@colorado.edu",
-    "notes": "created by Sharon Siman-Tov"
-  },
-  "usaLevel2.svg": {
-    "text": [
-      "Copyright 2024 University of Colorado Boulder"
-    ],
-    "projectURL": "https://phet.colorado.edu",
-    "license": "contact phethelp@colorado.edu",
-    "notes": "created by Sharon Siman-Tov"
-  },
-  "usaLevel3.svg": {
-    "text": [
-      "Copyright 2024 University of Colorado Boulder"
-    ],
-    "projectURL": "https://phet.colorado.edu",
-    "license": "contact phethelp@colorado.edu",
-    "notes": "created by Sharon Siman-Tov"
-  },
-  "usaLevel4.svg": {
-    "text": [
-      "Copyright 2024 University of Colorado Boulder"
-    ],
-    "projectURL": "https://phet.colorado.edu",
-    "license": "contact phethelp@colorado.edu",
-    "notes": "created by Sharon Siman-Tov"
   }
 }