Update SECURITY.md

SECURITY.md

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 ## Reporting a Vulnerability
 
-We rely on NPM's security advisory process for reporting vulnerabilities.
-
-You can submit a vulnerability in a Storybook package at: https://www.npmjs.com/advisories/report
-
-You can also reach out to the maintainers directly on Twitter: https://twitter.com/storybookjs
+To report a vulnerability, you can reach out to the maintainers directly on Twitter: https://twitter.com/storybookjs
 
 When we fix a security issue, we will post a security advisory on Github/NPM, describe the change in the [release notes](https://github.com/storybookjs/storybook/releases), and also announce notify the community on [our Discord](https://discord.gg/storybook).