explain how to configure server cert trust

[qrkourier]

In 2.6.1, a setting was added to require a verifiable server certificate, but how to set the setting or configure certificate trust still needs to be explained.

refs:

• mentioning feature added in 2.6.1 in the closed issue where it was requested: add a login option to require controller certificate verification #104 (comment)
• release notes announcing feature in 2.6.1: https://github.com/openziti/ziti-console/blob/ziti-console-lib-v0.0.10/release-notes.md?plain=1#L207 (interpret "self-signed certs" as "untrusted server certs")

It looks like the setting is named rejectUnauthorized and is false by default.