[yelp-xsl] Oops I forgot to add some CSS template files to Makefile.am

[Shaun McCance <shaunm src gnome org>]

commit 83285ef73649359eba97a27deb151a6758db4538
Author: Shaun McCance <shaunm redhat com>
Date:   Wed Feb 10 14:59:09 2021 -0500

    Oops I forgot to add some CSS template files to Makefile.am

 xslt/common/css/Makefile.am | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/xslt/common/css/Makefile.am b/xslt/common/css/Makefile.am
index de375bd4..a41a3a4e 100644
--- a/xslt/common/css/Makefile.am
+++ b/xslt/common/css/Makefile.am
@@ -2,7 +2,10 @@ cssdir=$(datadir)/yelp-xsl/xslt/common/css
 
 css_DATA =                     \
        core.css.tmpl           \
+       docbook.css.tmpl        \
        elements.css.tmpl       \
+       mallard.css.tmpl        \
+       mallard-editor.css.tmpl \
        syntax.css.tmpl
 
 EXTRA_DIST=$(css_DATA)