wip: add relay discover to onboarding

src-tauri/migrations/20230808085847_add_relays_table.sql

@@ -0,0 +1,10 @@
+-- Add migration script here
+CREATE TABLE
+  relays (
+    id INTEGER NOT NULL PRIMARY KEY,
+    account_id INTEGER NOT NULL,
+    relay TEXT NOT NULL,
+    purpose TEXT NOT NULL DEFAULT '',
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (account_id) REFERENCES accounts (id)
+  );