[ ] update alt for logos to include that it is a logo
The visual aspects of hte logo do not need to be described unless relevant in that context.
The OLH logo at top of page is read out as Open Library of Humanities without indicating it is a logo.
The OLH, Janeway, Birkbeck logos at the bottom of the page are ignored. I am not sure why they are not being read out, given there is a defined alt attribute for each of them. This is described further within #325
from #324