Remove Explorer API docs
Remove Explorer API docs

The explorer is not covered by the v1.0 API stability guarantee.
Its docs will be added back once the endpoints are stabilized.

mnsl/Sia,rivine/rivine,ChrisSchinnerl/Sia,ericflo/Sia,NebulousLabs/Sia,mharkus/Sia,ericflo/Sia,MrStrong/Sia,rivine/rivine,mtlynch/Sia,mharkus/Sia,MrStrong/Sia,NebulousLabs/Sia,mnsl/Sia,mtlynch/Sia,ChrisSchinnerl/Sia