Re-Enable exclusions of jekyll minifier (alshedivat#3038)

Resolve alshedivat#3037

This PR just re-enable the old exclusions of jekyll-minifier to ensure
that the files aren't altered.

Author: dfuchss

_config.yml

@@ -287,7 +287,7 @@ sass:
 
 jekyll-minifier:
   compress_javascript: false # set to false since we are using terser as the js minifier
-  # exclude: ["robots.txt", "assets/js/search/*.js"]
+  exclude: ["robots.txt", "assets/js/search/*.js"]
 
 # -----------------------------------------------------------------------------
 # Terser