Remove non working legacy pools

[degeri]

https://stakey.net => redirects to vspd
https://dcr.farm => redirects to vspd
https://testnet.decredvoting.com => down
https://dcrstakedinner.com => bad ssl and 502

[xaur]

dcr.farm indeed redirects to vsp.dcr.farm, even requests to API endpoints. As I wrote in #146 this may be inconvenient.

stakey.net shows the new vspd page but its legacy status endpoint still works and reports 86 tickets as of writing. Their support post says the legacy UI was removed but wallets and API will stay up.

I'm not entirely sure we should remove it from the listing. On the one hand the admin has clearly communicated to migrate to vspd, the API says it is Closed, and we should not advertise it in any way now. But if we remove it from the listing, the vsp page will no longer show its live ticket count and "updated X minutes ago", which is a comforting message that it is still up and voting the remaining tickets.

[degeri]

stakey.net is throwing an error for users in decrediton. It is better to remove it.

[xaur]

Oh I forgot that this API is also consumed by Decrediton. I agree it should be the priority use case and so any malfunctioning VSPs should be removed.

Perhaps we need a separate API for monitoring all VSPs.

[xaur]

I can access https://dcrstakedinner.com/ now