if we know the local validator isn't running, change the dropdown to …

[SvenDowideit]

…link to Manage validator

closes #137

idk, this isn't wonderful, but maybe its better

[nathanleclaire]

I think the "Closes" is meant to refer to a different issue than #137 ?

This LGTM -- I've also been meaning to add a nudge on that somewhat harsh first "Network not available" page