Clarify security status displayed in Brave address bar

[RubenKelevra]

Currently, all data received by the brave integration (#64) is marked as "not secure". While this is currently true for IPNS, it's not true for IPFS-CIDs.

I created a ticket to have a look at the integration of DNSSec to make sure we have domain-to-content validation and don't rely on unencrypted unsigned DNS requests which can be altered by MITM or DNS-Spoofing.

URLs with the IPFS-scheme are also marked as insecure, which is not true - so there's also a ticket (brave/brave-browser#13727) for that.

Originally I created a ticket here, but the content got moved to brave/brave-browser#13706.