[static-web] Move error to error-500

[Andrea Veri <av src gnome org>]

commit fa22dccb917872e4f9f783305ef44f0377ffd125
Author: Andrea Veri <av gnome org>
Date:   Mon Oct 6 12:27:51 2014 +0200

    Move error to error-500

 {error => error-500}/500.html  |    0
 {error => error-500}/grass.css |    0
 2 files changed, 0 insertions(+), 0 deletions(-)
---
diff --git a/error/500.html b/error-500/500.html
similarity index 100%
rename from error/500.html
rename to error-500/500.html
diff --git a/error/grass.css b/error-500/grass.css
similarity index 100%
rename from error/grass.css
rename to error-500/grass.css