Remove build.sh: we have a Makefile now

diff --git a/build.sh b/build.sh
deleted file mode 100755 (executable)
index 574f051..0000000
--- a/build.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-hotdoc run
-#cp -R attachments built_doc/html/
-#cp -R images built_doc/html/