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TWIG TEMPLATING SYSTEM
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Twig is a system for writing HTML "templates"-- HTML snippets that can have
variable names in it, which PHP will interpret and replace with the values.

We're gonna be using Twig, since it's really useful.

If you're front-end, writing HTML, look at `./twig_example.html` for a general
example of how you'll use Twig.
You can alo read `https://twig.symfony.com/doc/2.x/templates.html` if you want
more in-depth documentation, but you probably don't need it.

If you're back-end, writing PHP, look at
`https://twig.symfony.com/doc/2.x/api.html`.


Look at `variables.txt` for a list of the variables we'll be using.