feat!: Update dunbar markup

Currently the newest version of the markup is not on the main branch,
mostly because of polish and the documentation.

As an effect from the changes to the language, the sitemap is the only
thing which needs to be created externally.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/404.du b/src/404.du
index b23ffa7..4751930 100644
--- a/src/404.du
+++ b/src/404.du
@@ -1,3 +1,4 @@
+'def title 404 page not found!
 # 404 Not Found
 
 The page you were trying to access doesn't exist!