Extend bild to nix targets properly

Also had to capitalize some stuff, and move some nix files around and rename
the metadata directive from 'exe' to 'out' because that just makes more sense,
and fix some compiler errors. But now bild treats both nix and hs files as
buildable things. So that's cool.

One interesting example is Biz/Pie.{nix,hs} - I can either create a dev build of
the hs file with ghc, or I can create a fully-encapsulated nix build. Its nice
to have both options because a dev build with ghc takes half the amount of time,
and I can rely on my locally cached hi and ho files. I think this shows the
power of bild, but also can be a somewhat subtle thing.

The issue really is with the separate command calls in nix builds vs dev builds.
I figure there are a few ways to fix this:

1. Try to use bild inside the nix rules. That could be interesting, but could
also lead to some weird behavior or worm holes forming.
2. Extract the command line invocation into a separate file, some kind of
really simple template that gets pulled into both programs.

It is important to consider that in the future I might want to have bild do a
module-by-module nix build of programs, but I'm not sure how that would effect
my choice here.

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+% que.run
+
+que.run is the concurrent, async runtime in the cloud
+
+  - runtime concurrency anywhere you have a network connection
+  - multilanguage communicating sequential processes
+  - add Go-like channels to any language
+  - connect your microservices together with the simplest possible
+    plumbing
+  - async programming as easy as running two terminal commands
+
+HTTP routes on `que.run` are Golang-like channels with a namespace and a
+path. For example: `https://que.run/pub/path/subpath`.
+
+## Quickstart
+
+There is a simple script `que` that acts as a client you can use to
+interact with the `que.run` service.
+
+Download it to somewhere on your `$PATH` and make it executable:
+
+    curl https://que.run/_/client > ~/bin/que
+    chmod +x ~/bin/que
+    que --help
+
+The client requires a recent version of Python 3.
+
+## Powerup
+
+que.run is free for limited use, but the real power of an asynchronous,
+concurrent runtime in the cloud is unlocked with some extra power-user
+features.
+
+- Free
+  - security by obscurity
+  - all protocols and data formats supported
+  - bandwidth and message sizes limited
+  - concurrent connections limited
+  - request rate limited
+- Power
+  - protect your data with private namespaces
+  - remove bandwidth and size limits
+  - private dashboard to see all of your active ques
+  - 99.999% uptime
+- Pro
+  - add durability to your ques so messages are never lost
+  - powerful batch api
+  - incredible query api
+  - Linux FUSE filesystem integration
+- Enterprise
+  - all of the Power & Pro features
+  - on-prem deployment
+  - advanced que performance monitoring
+  - SLA for support from que.run experts
+
+Email `ben@bsima.me` if you want to sign up for the Power, Pro, or
+Enterprise packages.
+
+## Quescripts
+
+We are collecting a repository of scripts that make awesome use of que:
+
+- remote desktop notifications
+- two-way communication with your phone
+- ephemeral, serverless chat rooms
+- collaborative jukebox
+
+<a id="quescripts-btn" href="/_/quescripts">See the scripts</a>
+
+## Docs
+
+- [tutorial](/_/tutorial)
+- [api docs](/_/apidocs)