chore: remove mentions of huntr.dev

huntr.dev has pivoted to ML/AI-only vulnerability reporting, and we are
now already using GitHub's private vulnerability reports.

README.md

@@ -17,7 +17,6 @@ To learn more, visit [ohmyz.sh](https://ohmyz.sh), follow [@ohmyzsh](https://twi
 [![Mastodon Follow](https://img.shields.io/mastodon/follow/111169632522566717?label=%40ohmyzsh&domain=https%3A%2F%2Fmstdn.social&logo=mastodon&style=flat)](https://mstdn.social/@ohmyzsh)
 [![Discord server](https://img.shields.io/discord/642496866407284746)](https://discord.gg/ohmyzsh)
 [![Gitpod ready](https://img.shields.io/badge/Gitpod-ready-blue?logo=gitpod)](https://gitpod.io/#https://github.com/ohmyzsh/ohmyzsh)
-[![huntr.dev](https://cdn.huntr.dev/huntr_security_badge_mono.svg)](https://huntr.dev/bounties/disclose/?utm_campaign=ohmyzsh%2Fohmyzsh&utm_medium=social&utm_source=github&target=https%3A%2F%2Fgithub.com%2Fohmyzsh%2Fohmyzsh)
 
 <details>
 <summary>Table of Contents</summary>

SECURITY.md

@@ -17,8 +17,7 @@ In the near future we will introduce versioning, so expect this section to chang
 
 **Do not submit an issue or pull request**: this might reveal the vulnerability.
 
-Instead, you should email the maintainers directly at: [**security@ohmyz.sh**](mailto:security@ohmyz.sh).
+Instead, you should email the maintainers directly at: [**security@ohmyz.sh**](mailto:security@ohmyz.sh),
+or using the link to [privately report a vulnerability with GitHub](https://github.com/ohmyzsh/ohmyzsh/security/advisories/new).
 
 We will deal with the vulnerability privately and submit a patch as soon as possible.
-
-You can also submit your vulnerability report to [huntr.dev](https://huntr.dev/bounties/disclose/?utm_campaign=ohmyzsh%2Fohmyzsh&utm_medium=social&utm_source=github&target=https%3A%2F%2Fgithub.com%2Fohmyzsh%2Fohmyzsh) and see if you can get a bounty reward.