refactor: remove electron-related code

src/lib/url.ts

@@ -0,0 +1,16 @@
+export function isWebsocketUrl(url: string): boolean {
+  return /^wss?:\/\/.+$/.test(url)
+}
+
+// copy from nostr-tools/utils
+export function normalizeUrl(url: string): string {
+  if (url.indexOf('://') === -1) url = 'wss://' + url
+  const p = new URL(url)
+  p.pathname = p.pathname.replace(/\/+/g, '/')
+  if (p.pathname.endsWith('/')) p.pathname = p.pathname.slice(0, -1)
+  if ((p.port === '80' && p.protocol === 'ws:') || (p.port === '443' && p.protocol === 'wss:'))
+    p.port = ''
+  p.searchParams.sort()
+  p.hash = ''
+  return p.toString()
+}