renamed slugs that had been incorrectly capitalized

src/_data/systems.js

@@ -1,38 +1,74 @@
 module.exports = [
   {
-    slug: 'skeletal', name: 'Skeletal', status: 'free', order: 1,
+    slug: 'skeletal',
+    name: 'Skeletal',
+    status: 'free',
+    order: 1,
   },
   {
-    slug: 'ligamentous', name: 'Ligamentous', status: 'free', order: 2,
+    slug: 'ligamentous',
+    name: 'Ligamentous',
+    status: 'free',
+    order: 2,
   },
   {
-    slug: 'muscular', name: 'Muscular', status: 'pro', order: 3,
+    slug: 'muscular',
+    name: 'Muscular',
+    status: 'pro',
+    order: 3,
   },
   {
-    slug: 'digestive', name: 'Digestive', status: 'pro', order: 4,
+    slug: 'digestive',
+    name: 'Digestive',
+    status: 'pro',
+    order: 4,
   },
   {
-    slug: 'respiratory', name: 'Respiratory', status: 'pro', order: 5,
+    slug: 'respiratory',
+    name: 'Respiratory',
+    status: 'pro',
+    order: 5,
   },
   {
-    slug: 'urogenital', name: 'Urogenital', status: 'pro', order: 6,
+    slug: 'urogenital',
+    name: 'Urogenital',
+    status: 'pro',
+    order: 6,
   },
   {
-    slug: 'endocrine', name: 'Endocrine', status: 'pro', order: 7,
+    slug: 'endocrine',
+    name: 'Endocrine',
+    status: 'pro',
+    order: 7,
   },
   {
-    slug: 'Arterial', name: 'Arterial', status: 'soon', order: 8,
+    slug: 'arterial',
+    name: 'Arterial',
+    status: 'soon',
+    order: 8,
   },
   {
-    slug: 'Venous', name: 'Venous', status: 'soon', order: 9,
+    slug: 'venous',
+    name: 'Venous',
+    status: 'soon',
+    order: 9,
   },
   {
-    slug: 'nervous', name: 'Nervous', status: 'soon', order: 10,
+    slug: 'nervous',
+    name: 'Nervous',
+    status: 'soon',
+    order: 10,
   },
   {
-    slug: 'lymphatic', name: 'Lymphatic', status: 'soon', order: 11,
+    slug: 'lymphatic',
+    name: 'Lymphatic',
+    status: 'soon',
+    order: 11,
   },
   {
-    slug: 'integumentary', name: 'Integumentary', status: 'soon', order: 12,
+    slug: 'integumentary',
+    name: 'Integumentary',
+    status: 'soon',
+    order: 12,
   },
 ];