WordCamp: Improve individual session and speaker pages

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Imported from https://meta.trac.wordpress.org/ticket/4569
Created by @melchoyce:

Instead of outputting the speaker/session information at the bottom of the page, what if we automatically added the appropriate block, so you could control what information is shown on single pages?

So: On an individual speaker page, it would have the speaker's bio, and then the speaker's session, output in the editor as a single session block with that speaker's session selected.

I understand that this is much better suited to an eventual Gutenberg template framework, but even though it might be a pain in the short-term to update every block if you do want to customize the block settings, I think it could be an okay bandaid improvement.

See attached mockup for what I'm thinking on the front-end.

• Add sessions list and other details to speaker pages #653
• Session's date/time on session info page #651
• Add Website and Twitter fields to Speakers post type / shortcode #647

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Comment by @melchoyce:

• Speaker.png added

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Comment by slackbot:

This ticket was mentioned in Slack in #meta-wordcamp by sippis. View the logs.