move hausner guide into year-month directory

[challenge-bot] / guide / hausner / org-html-themes

diff --git a/guide/hausner/org-html-themes b/guide/hausner/org-html-themes
deleted file mode 160000 (submodule)
index b68f268..0000000
--- a/guide/hausner/org-html-themes
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit b68f268a142078c9ba176129202fa7b6082745ed