TODO:
+ set appropriate MIME types

TODO:
+ file-serving if no user-defined routes match. Search "public/" dir
unless otherwise specified by user.
+ query arguments
+ PUT, POST, DELETE
+ templating
+ fuzzy-/pattern-match-enabled user routes (e.g., /something/*/wildcard)?

The aim is to try to avoid polluting the global wordlist with routing
functions.

The alternative would be to have users simply define words that match
their routes, e.g.:
```
: 1991/hi
    ( some definition of hi's handler )
    ;
```

I'm still not entirely convinced that the above method isn't a better
solution.

First, define a user-facing word that takes a port and subsequently
starts the server (using gforth's unix/socket.fs).
Second, start defining a user-facing word for specifing routes and their
handlers.