Fixed missing css on main page

package.nix

@@ -25,7 +25,7 @@
     (setq org-html-validation-link nil            ;; Don't show validation link
           org-html-head-include-scripts nil       ;; Use our own scripts
           org-html-head-include-default-style nil ;; Use our own styles
-          org-html-head "<link rel=\"stylesheet\" href=\"${./style.css}\" />")
+          org-html-head "<link rel=\"stylesheet\" href=\"./style.css\" />")
 
         ;; Generate the site output
         (org-publish-all t)
@@ -40,6 +40,7 @@ in
     '';
     installPhase = ''
       mkdir -p $out
+      cp ${./style.css} $out/style.css
       cd public
       cp -r . $out/
     '';