Move cloudflare tunnel creation back into startup.sh (#2694)

## Description:
Reverts #49b01d8

Move cloudflare tunnel creation back into startup.sh. This keeps the
infra outside of the main app.
## Please complete the following:

- [ ] I have added screenshots for all UI updates
- [ ] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [ ] I have added relevant tests to the test directory
- [ ] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/core/configuration/Config.ts

@@ -59,10 +59,6 @@ export interface ServerConfig {
   jwkPublicKey(): Promise<JWK>;
   domain(): string;
   subdomain(): string;
-  cloudflareAccountId(): string;
-  cloudflareApiToken(): string;
-  cloudflareConfigPath(): string;
-  cloudflareCredsPath(): string;
   stripePublishableKey(): string;
   allowedFlares(): string[] | undefined;
   enableMatchmaking(): boolean;