Improve and document how to easily "archive" previous years

[abraham]

It should be easier to keep previous years conferences sites around. I'm thinking the approach should be to copy all the data to another Firebase project excluding the blog posts which should stay on the main site. Some things to include:

• [ ] npm script to copy entire database from one project to another
• [ ] npm script to copy images from one project to another
  • links in the database will not be updated
• [ ] Simplify pointing/redirecting blog to another site
• [ ] disable/clear schedule on current site
• [ ] Git repo branching suggestions
• [ ] Documentation page describing process