chore: remove logo from header and README

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/page.tsx

@@ -78,18 +78,14 @@ export default async function HomePage({ searchParams }: PageProps) {
           justifyContent: "space-between",
           gap: 12,
         }}>
-          <div style={{ display: "flex", alignItems: "center", gap: 10 }}>
-            {/* eslint-disable-next-line @next/next/no-img-element */}
-            <img src="/logo.svg" alt="" style={{ height: 28, width: "auto" }} />
-            <span style={{
-              fontSize: "1.1rem",
-              fontWeight: 700,
-              color: "var(--color-text)",
-              letterSpacing: "-0.02em",
-            }}>
-              Thoosie Calendar
-            </span>
-          </div>
+          <span style={{
+            fontSize: "1.1rem",
+            fontWeight: 700,
+            color: "var(--color-text)",
+            letterSpacing: "-0.02em",
+          }}>
+            Thoosie Calendar
+          </span>
 
           <span style={{
             background: "var(--color-surface)",