docs: delete SECURITY.md

Moved to the `.github` repository

SECURITY.md

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-# Security Policy
-
-## Reporting a Vulnerability
-
-If you have any reason to believe that there are security vulnerabilities across any repository in the organisation,
-please report to **[core@catppuccin.com](mailto:core@catppuccin.com)**.
-
-We will respond within **2 - 3 business days.**
-If the report is confirmed to be true, we will make the necessary changes required to fix the issue.
-We will deploy a patch as soon as possible depending on the type of port and complexity of the issue.