Frontend issues following deployment

[AHTARazzak]

• Members page images sometimes take long to load?
• GET https://lehtiolab.github.io/src/assets/img/sponsors/kiLogo.png 404 (Not Found)
• linking to subpages leads to 404, need to figure out routing.

[MarkusJonsson-SciLifeLab]

Also SubcellLogo.png.