Serving files is working

Right now we're not doing any streaming and this isn't ideal. I'll need
to figure it out at some point.

Cargo.toml

@@ -9,6 +9,7 @@ edition = "2018"
 [dependencies]
 actix-web = "2.0"
 actix-rt = "1.0"
+actix-files = "0.2.2"
 futures = "0.3.5"
 jsonwebtoken = "7.2.0"
 serde = "1.0"