Update sched: add Karen and Abhas

See merge request !15

Add Sayantan bio

See merge request !14

By doing so, we can make it easier to edit schedule without worrying
about closing all opened tags, etc.

Uses:
- https://gohugo.io/templates/data-templates/
- https://gohugo.io/templates/shortcode-templates/

Adds Diaspora along with ActivityPub

See merge request !11

Add table for sessions

See merge request !13

Earlier a "production" git branch was used to keep the generated HTML
(along with a LICENSE file). This is an anti-pattern.

Hugo can generate output to different folder anyhow.

With the new setup, we will delete the production branch and keep only
the source files in git. The output will be directly generated on the server
with hugo and served by nginx from a separate folder.

Instead of git push, the deployment is triggered by
`ssh -t "./update-camp-website"`
which runs a script on the server.

Ideally, a webhook should do that automatically on any commits to master.
But that requires a webhook listening and can be considered later.

Close learner registration

See merge request !12

Add Mailing List Archive Link

See merge request !10

Add ActivityPub to Communication Infrastructure List

Closes #45

See merge request !9

Add onboarding to nav bar, update schedule and learners.md

See merge request !7

Add SEO Optimization

Closes #41

See merge request !6