refact: Fully refactor the conceptional structure and functional behaviour.

YaeBlog.Core/Extensions/ServiceCollectionExtensions.cs

@@ -0,0 +1,30 @@
+using Markdig;
+using Microsoft.Extensions.DependencyInjection;
+using YamlDotNet.Serialization;
+using YamlDotNet.Serialization.NamingConventions;
+
+namespace YaeBlog.Core.Extensions;
+
+public static class ServiceCollectionExtensions
+{
+    public static IServiceCollection AddMarkdig(this IServiceCollection collection)
+    {
+        MarkdownPipelineBuilder builder = new();
+
+        collection.AddSingleton<MarkdownPipeline>(_ => builder.Build());
+
+        return collection;
+    }
+
+    public static IServiceCollection AddYamlParser(this IServiceCollection collection)
+    {
+        DeserializerBuilder builder = new();
+
+        builder.WithNamingConvention(CamelCaseNamingConvention.Instance);
+        builder.IgnoreUnmatchedProperties();
+
+        collection.AddSingleton<IDeserializer>(_ => builder.Build());
+
+        return collection;
+    }
+}