PLANET-5254 Author page accessibility

[planet-4]

The author page looks generally ok. Some minor issues:

• It reads the name, then the picture has the name as ALT tag so it reads the name tag. It could say "Picture of..." instead.
• The share buttons are read between the picture and the bio, maybe we should render somewhere else in the DOM.

The "posts by" section is ok, we have a few issues with the article teasers (the list of articles), but we'll deal with those in separate tickets, maybe as part of the Articles Block accessibility ticket.

Reporter: pcuadrad
Sections: 

Potentially affected repositories: planet4-plugin-gutenberg-blocks

[comzeradd]

Fixed at greenpeace/planet4-master-theme#1220