Cert expired for nitter.net
The Lets Encrypt cert used by nitter.net just expired:

Valid until: Sunday, October 29, 2023 at 5:52:28 AM

Results in following error in browsers:

```
Your connection is not private
Attackers might be trying to steal your information from nitter.net (for example, passwords, messages, or credit cards). [Learn more](chrome-error://chromewebdata/#)
NET::ERR_CERT_DATE_INVALID
```