Add the OpenSSF Badge to the new site #6031
Description
Placeholder so we don't forget to port this work to the new site design - where it will likely not be in the footer.
do we know what content is within the new "Security Reporting" page? if it's just a rename of the current "Security" page, that wont work well - as that's just a link to https://github.com/nodejs/node/security/policy#security
Originally posted by @bmuenzenmeyer in #5432 (comment)