Corrected some out of date security information

[jburger]

:wave: Corrected some out of date information regarding accessing pen. test reports, including links to our trust centre and additional context regarding our certifications.

[steve-fenton-octopus]

Hey @jburger - I just wanted to check back in on this one to see if there's anything stopping it from being merged?

[jburger]

Thanks Steve! Shipped 🚀