Presage test site

To build the site:

1. Install juliaup (run curl -fsSL https://install.julialang.org | sh or brew install juliaupin a terminal on macOS or Linux, or winget install julia -s msstore on Windows)
2. Use juliaup to install julia
3. Clone this repository
4. Navigate to the repository directory in a terminal
5. Start julia and activate this environment with ] activate ., where ] is the command to enter the julia REPL Package mode.
6. Instantiate this environment with instantiate while still in package mode.
7. At the normal julia prompt (use backspace to exit package mode), run using Franklin to load Franklin.jl.
8. serve() will start a local server at http://localhost:8000
9. publish() will publish the site to Netlify