[fix] .gitattributes: bootstrap.css & .js has been moved to oscar

see 86912e22 [mod] oscar: get bootstrap and typeahead from NPM

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

.gitattributes

@@ -1,5 +1,5 @@
-searx/static/css/bootstrap.min.css -diff
-searx/static/js/bootstrap.min.js -diff
+searx/static/themes/oscar/css/bootstrap.min.css -diff
+searx/static/themes/oscar/js/bootstrap.min.js -diff
 searx/static/themes/oscar/css/logicodev.min.css -diff
 searx/static/themes/oscar/css/leaflet.min.css -diff
 searx/static/themes/oscar/css/pointhi.min.css -diff