Change Skin -> Theme

To better align with commonly used terminology in industry renamed all references from Skin -> Theme.

Oqtane.Server/Controllers/ThemeController.cs

@@ -6,20 +6,20 @@ using Oqtane.Models;
 namespace Oqtane.Controllers
 {
     [Route("{site}/api/[controller]")]
-    public class SkinController : Controller
+    public class ThemeController : Controller
     {
-        private readonly ISkinRepository skins;
+        private readonly IThemeRepository themes;
 
-        public SkinController(ISkinRepository Skins)
+        public ThemeController(IThemeRepository Themes)
         {
-            skins = Skins;
+            themes = Themes;
         }
 
         // GET: api/<controller>
         [HttpGet]
-        public IEnumerable<Skin> Get()
+        public IEnumerable<Theme> Get()
         {
-            return skins.GetSkins();
+            return themes.GetThemes();
         }
     }
 }