Add the sustainability catagory to some existing icons (#2384)

icons/leafy-green.json

@@ -13,6 +13,7 @@
   ],
   "categories": [
     "food-beverage",
-    "emoji"
+    "emoji",
+    "sustainability"
   ]
 }

icons/sprout.json

@@ -11,6 +11,7 @@
   ],
   "categories": [
     "nature",
-    "gaming"
+    "gaming",
+    "sustainability"
   ]
 }

icons/sun.json

@@ -14,6 +14,7 @@
   "categories": [
     "accessibility",
     "weather",
-    "seasons"
+    "seasons",
+    "sustainability"
   ]
 }

icons/tree-deciduous.json

@@ -11,6 +11,7 @@
     "nature"
   ],
   "categories": [
-    "nature"
+    "nature",
+    "sustainability"
   ]
 }

icons/tree-palm.json

@@ -9,7 +9,8 @@
     "island"
   ],
   "categories": [
-    "nature"
+    "nature",
+    "sustainability"
   ],
   "aliases": [
     "palmtree"

icons/tree-pine.json

@@ -13,6 +13,7 @@
     "nature"
   ],
   "categories": [
-    "nature"
+    "nature",
+    "sustainability"
   ]
 }

icons/trees.json

@@ -10,6 +10,7 @@
     "nature"
   ],
   "categories": [
-    "nature"
+    "nature",
+    "sustainability"
   ]
 }

icons/waves.json

@@ -15,6 +15,7 @@
   "categories": [
     "weather",
     "maps",
-    "multimedia"
+    "multimedia",
+    "sustainability"
   ]
 }

icons/wind.json

@@ -11,6 +11,7 @@
     "blow"
   ],
   "categories": [
-    "weather"
+    "weather",
+    "sustainability"
   ]
 }