Customize Bootstrap Relays (#205)

* feat: add bootstrap relays file

* feat: add save bootstrap relays command

* feat: add customize bootstrap relays screen

packages/types/index.d.ts

@@ -179,3 +179,8 @@ export interface Relays {
 	write: string[];
 	both: string[];
 }
+
+export interface Relay {
+	url: string;
+	purpose: "read" | "write" | string;
+}