Add Slug

Author: curtisdelicata

database/migrations/2023_10_26_164941_create_contents_table.php

@@ -21,6 +21,7 @@ public function up(): void
             $table->integer('category_id');
             $table->string('content_status');
             $table->string('featured_image_url')->nullable();
+            $table->string('slug')->unique()
             $table->timestamps();
 
             $table->foreign('author_id')->references('author_id')->on('authors');