studio(a11y): presentations should have better naming

[donroyco]

Current behaviour

When navigating through the presentations with MacOS built in VoiceOver, it just speaks out the URLs leading to Google Firebase storage.

Reproducible steps:

1. Go to https://deckdeckgo.com/
2. Switch on VoiceOver (Cmd + F5)
3. Navigate with tab to the list of presentations

Expected behaviour

It should speak out the title of the presentation (in combination with the author).

[peterpeterparker]

freak me, the alt tag is missing, sorry for that

thanks a lot @donroyco for these accessibility tests 🙏

[donroyco]

Would adding

aria-label={deck.data.meta.title}

to the link element make sense? I am not sure if the meta title is always available.

[peterpeterparker]

It makes sense. Title is mandatory in the meta data.