[Proposal] Add intercept.v1 config type doc reference to /reference/config-types/ for consistency

[nenkoru]

After a thorough documentation reading session, I think it might be worth to put an intercept.v1 config-type reference to the Config Types section of the documentation.

This would improve the overall consistency because for now for me to get to the reference page for the intercept.v1 I have to do Learn -> Core Concepts -> Configuration Store -> Tunneler Config Type intercept.v1
When with host.v1 I could just do
Reference -> Config Types -> host.v1

[qrkourier]

relatedly, #334 (comment)