Remove reference to sitedb url

[nataliaratnikova]

SiteDB url is defined in configuration and then used in the web page text, both need to be removed , posisble replaced by CRIC url .

Here is the related code:

./Documentation/WebConfig/phedexweb-app.conf:sitedb-url: https://cmsweb.cern.ch/sitedb/sitedb/sitelist/
./Documentation/WebSite/access25:434: my $sitedb_url = $$self{CONFIG}{SITEDB_URL} || 'blank';
./Documentation/WebSite/access25:2919: my $sitedb_url = $$self{CONFIG}{SITEDB_URL} || 'blank';