Add colophon to show some build info.

Author: dvanhorn

www/colophon.scrbl

@@ -0,0 +1,23 @@
+#lang scribble/base
+@(require racket/date
+          racket/port
+          racket/system
+	  racket/string)
+
+@(define (shell s)
+   (with-output-to-string (λ () (system s))))
+
+@(define (i s)
+   (item (verbatim (shell s))))
+
+@title{Colophon}
+
+This document (@string-trim[(shell "git rev-parse --short HEAD")]) was produced on @(date->string (current-date) #t).
+
+System information:
+@itemlist[
+ (i "uname -a")
+ (i "racket --version")
+ (i "raco pkg show -u a86 langs")
+ (i "nasm --version")
+ (i "gcc --version")]

www/main.scrbl

@@ -105,3 +105,4 @@ staff using this @link[feedback]{form}.
 @include-section{midterms.scrbl}
 @include-section{project.scrbl}
 @include-section{software.scrbl}
+@include-section{colophon.scrbl}