chore: bump theme submodule (obsolete article banner)

diff --git a/themes/danix-xyz-hacker b/themes/danix-xyz-hacker
index 749cb3b4dc0c5ee7b9a2622a6cb1d731ffbc5004..1815a9655e832a689891ee0843c8f5633a1bb4f5 160000 (submodule)
--- a/themes/danix-xyz-hacker
+++ b/themes/danix-xyz-hacker
@@ -1 +1 @@
-Subproject commit 749cb3b4dc0c5ee7b9a2622a6cb1d731ffbc5004
+Subproject commit 1815a9655e832a689891ee0843c8f5633a1bb4f5