git: Make delta dark and side-by-side

.gitconfig

@@ -11,8 +11,8 @@
 [delta]
     features = side-by-side line-numbers decorations
     whitespace-error-style = 22 reverse
-    side-by-side = false
-    light = true
+    side-by-side = true
+    light = false
 
 [delta "decorations"]
     commit-decoration-style = bold yellow box ul