Pull out info on the docs.perl6.org build

BUILD.md

@@ -0,0 +1,17 @@
+# htmlify.p overview
+
+For syntax highlighting, needs node.js installed.
+Please run make init-highlights to automatically pull in the highlighting
+grammar and build the highlighter.
+
+For doc.perl6.org, the build process goes like this:
+a cron job on hack.p6c.org as user 'doc.perl6.org' triggers the rebuild.
+
+    */5 * * * * flock -n ~/update.lock -c ./doc/util/update-and-sync > update.log 2>&1
+
+`util/update-and-sync` is under version control in the perl6/doc repo (same as
+this file), and it first updates the git repository. If something changed, it
+runs htmlify, captures the output, and on success, syncs both the generated
+files and the logs. In case of failure, only the logs are synchronized.
+
+The build logs are available at https://docs.perl6.org/build-log/

htmlify.p6

@@ -1,27 +1,6 @@
 #!/usr/bin/env perl6
 use v6.c;
 
-=begin overview
-
-This script isn't in bin/ because it's not meant to be installed.
-For syntax highlighting, needs node.js installed.
-Please run C<make init-highlights> to automatically pull in the highlighting
-grammar and build the highlighter.
-
-For doc.perl6.org, the build process goes like this:
-a cron job on hack.p6c.org as user 'doc.perl6.org' triggers the rebuild.
-
-    */5 * * * * flock -n ~/update.lock -c ./doc/util/update-and-sync > update.log 2>&1
-
-C<util/update-and-sync> is under version control in the perl6/doc repo (same as
-this file), and it first updates the git repository. If something changed, it
-runs htmlify, captures the output, and on success, syncs both the generated
-files and the logs. In case of failure, only the logs are synchronized.
-
-The build logs are available at https://docs.perl6.org/build-log/
-
-=end overview
-
 BEGIN say 'Initializing ...';
 
 use lib 'lib';