docs: add reference to the Threat Model

* docs: add Threat Model

* docs: update reference

Co-authored-by: Chris de Almeida <ctcpip@users.noreply.github.com>

* docs: improve readability

Co-authored-by: Chris de Almeida <ctcpip@users.noreply.github.com>

* docs: add reference to the Threat Model

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Co-authored-by: Chris de Almeida <ctcpip@users.noreply.github.com>