Linting

[Arnei]

Building the admin-ui-picard module via mvn install spits out a slew of linting warnings. Maybe we should do something about that.

[Arnei]

A big amount of warnings are pertaining to jsx-a11y/anchor-is-valid and jsx-a11y/anchor-has-content. This is because the new Admin UI thoroughly misuses <a> tags as easy-to-stiyle buttons. Fixing this properly will likely require some systematic planning and a lot of CSS rewriting. So much so that I think it's worth its own issue.