"Login / Signup" at upper right of wordpress pages is confusing.

## Bug report form
### Steps to reproduce
1. Go to any wordpress page: https://hypothes.is/education/

### Expected behaviour
I assume that I'm logged in, because I'm logged in at hypothes.is

### Actual behaviour
Apparently I'm not because it says "Login / Signup"
In fact however, I am logged in-- wordpress just doesn't know, and can't (at present).

### Your solution
Potentially we could just remove those from the template, since they don't meaningfully communicate login state.

Use the WordPress page at https://hypothes.is/education/ as the entry point and inspect the template that renders the upper-right “Login / Signup” links. Remove those links if that is the chosen approach, then verify that the page no longer presents a misleading login state.

Written by the indexing model from the issue text.