Update dispute link when a site is blocked by a non-MetaMask phishing list

[Gudahtt]

We are about to start using a second list of suspicious sites, maintained by Phishfort. We should ensure we are not directing users to eth-phishing-detect to dispute sites blocked by Phishfort.

Currently this warning page directs users to eth-phishing-detect to dispute blocked sites, with the "please file an issue" link.

We could ask Phishfort for a new dispute URL to use for their list, or a set of instructions on how users can dispute blocks. Or we could hide all instructions on disputing a block when a site is blocked by Phishfort. Either way, that section will need to be conditionally rendered, and we'll need a new query string parameter to communicate which config the block is coming from or how to handle disputes.

[adonesky1]

Phishphort does not yet have a site, we should link to their github issues

[sethkfman]

Mobile PR with link to Phishfort reporting: MetaMask/metamask-mobile#4485