Add Disallow statements

Found two lines in robots.txt at UFAL's installation that seem ok. Add
also to our stash:
```
Disallow: /repository/*allzip$
Disallow: /repository/oai/requeststripped
```

dockerfiles/commul-customization/robots-clarin.txt

@@ -16,6 +16,8 @@ Disallow: /repository/xmlui/forgot
 Disallow: /repository/xmlui/login
 Disallow: /repository/xmlui/register
 Disallow: /repository/xmlui/search-filter
+Disallow: /repository/*allzip$
+Disallow: /repository/oai/requeststripped
 Disallow: /Shibboleth.sso
 #
 # Optionally uncomment the following line ONLY if sitemaps are working