There's a check for `nezu.logo` in two spots, but not in another

There's a check for `nezu.logo` [here](https://github.com/typlog/nezu/blob/205e03d4d80d184a3850ed91542bbf1afb1242ce/_partials/head.j2#L5) and [here](https://github.com/typlog/nezu/blob/188958a8bd97edc84355e0dd70c12b76bc8e910d/_partials/common.j2#L12); there should probably be one [here](https://github.com/typlog/nezu/blob/9682ee49b5ba26083def80f847357b8076ba48f0/_partials/site_info.j2#L3) too?