Add Lotusdocs theme

themes/lotusdocs/SECURITY.md

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+# Reporting Security Issues
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+The Lotus Labs team and community take security issues in Lotus Docs seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
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+To report a security issue, email [security@aigis.uk](mailto:security@aigis.uk) and include the word "SECURITY" in the subject line.
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+We'll endeavour to respond quickly, and will keep you updated throughout the process.