Use round logo with highlight color

packages/app/src/Element/Avatar.tsx

@@ -1,5 +1,5 @@
 import "./Avatar.css";
-import Nostrich from "public/logo.png";
+import Nostrich from "public/logo_256.png";
 
 import { CSSProperties, useEffect, useState } from "react";
 import type { UserMetadata } from "@snort/system";

packages/app/src/Element/RelaysMetadata.tsx

@@ -1,5 +1,5 @@
 import "./RelaysMetadata.css";
-import Nostrich from "public/logo.png";
+import Nostrich from "public/logo_256.png";
 import { useState } from "react";
 
 import { FullRelaySettings } from "@snort/system";

packages/app/src/Notifications.ts

@@ -1,4 +1,4 @@
-import Nostrich from "public/logo.png";
+import Nostrich from "public/logo_256.png";
 
 import { TaggedRawEvent, EventKind, MetadataCache } from "@snort/system";
 import { getDisplayName } from "Element/ProfileImage";

packages/app/src/Pages/settings/Profile.tsx

@@ -1,5 +1,5 @@
 import "./Profile.css";
-import Nostrich from "public/logo.png";
+import Nostrich from "public/logo_256.png";
 import { useEffect, useState } from "react";
 import { FormattedMessage } from "react-intl";
 import { useNavigate } from "react-router-dom";