Improve homepage layout and admin dashboard navigation

Remove sorting controls and media outlet title from the homepage. Adjust admin dashboard layout to place the description next to the logo.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 069d4324-6c40-4355-955e-c714a50de1ea
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/069d4324-6c40-4355-955e-c714a50de1ea/gVirbWH

client/src/components/MainContent.tsx

@@ -88,23 +88,6 @@ export default function MainContent() {
   return (
     <div className="min-h-screen bg-gray-50">
       <div className="max-w-7xl mx-auto px-4 py-4">
-        {/* Sorting Controls */}
-        <div className="flex items-center justify-between mb-6">
-          <h1 className="text-2xl font-bold text-gray-900">언론매체</h1>
-          <div className="flex items-center space-x-2">
-            <ArrowUpDown className="h-4 w-4 text-gray-500" />
-            <Select value={sortBy} onValueChange={(value: "alphabetical" | "traffic") => setSortBy(value)}>
-              <SelectTrigger className="w-[180px]" data-testid="sort-select">
-                <SelectValue placeholder="정렬 방식" />
-              </SelectTrigger>
-              <SelectContent>
-                <SelectItem value="alphabetical" data-testid="sort-alphabetical">ABC 순</SelectItem>
-                <SelectItem value="traffic" data-testid="sort-traffic">트래픽 순</SelectItem>
-              </SelectContent>
-            </Select>
-          </div>
-        </div>
-
         {isLoading ? (
           <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
             {categories.map((category) => (