Move instruction set extensions admin index to Blazor.

Marechai/Services/InstructionSetExtensionsService.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Marechai.Database.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace Marechai.Services
+{
+    public class InstructionSetExtensionsService
+    {
+        readonly MarechaiContext _context;
+
+        public InstructionSetExtensionsService(MarechaiContext context) => _context = context;
+
+        public async Task<List<InstructionSetExtension>> GetAsync() =>
+            await _context.InstructionSetExtensions.OrderBy(e => e.Extension).ToListAsync();
+    }
+}