Update UAL Logo

[seanluyk]

Is your feature request related to a problem? Please describe. With the recent name change from Libraries to Library, we should update the header logo accordingly

Describe the solution you'd like Update logo in the header to the new University of Alberta Library logo, available from the Media Toolkit

[jefferya]

@seanluyk

• updated logo
• also updated text in on the site (e.g., homepage blurb, about ERA A+V, technology and partnerships page): see https://github.com/ualbertalib/avalon/pull/655/files for details. Would like second set of eyes to verify correctness

[seanluyk]

Thanks @jefferya!