Release the gh-pages site

[thekaveman]

This is a tracking issue for the steps to take to make the cut-over from Netlify to gh-pages official.

These steps more-or-less have to happen at the same time/close together.

1. GitHub

• fix Implement redirects on gh-pages site #106 (proposed solution in Implement redirects for gh-pages #107)
• update the site URL in _config.yml
• make gh-pages the default branch
• remove Netlify webhook
• remove Netlify service integration
• remove Netlify deploy keys
• add a custom domain pointing to www.hackforla.org

2. DNS provider (Aplus)

• [x] configure a CNAME in DNS to point to the hackforla.github.io domain
• remove CNAME from Aplus because it is not authoritative

3. (The authoritative) DNS provider (CloudFlare)

• modify CNAME for www from hackforla.netlify.com to hackforla.github.io
• enable auto-HTTPS forwarding.

4. Netlify

• remove hackforla.org and www.hackforla.org domains from Netlify site
• delete the DNS zone in Netlify

5. GitHub (again)

• remove and then add back the custom domain to trigger HTTPS
• create a branch from master called netlify, push it, and delete master.
• release 2.0.0

/cc @abregorivas @ddrosario @ExperimentsInHonesty @jjandoc