we do not have any webpage as such provided by vmware unless you integrate all the VCs via linked mode or other application.
Here, you need to do manual work to create your own inventory. RVTools report can be used for that
1. Connect RVtools to individual vCenter server and export the VM details to xl file.
2. Collate the extracted data from all the vCenter server to one single sheet.
3. You may use that sheet to search the VM whenever needed.
above task has to be done often based on the changes in your vcenter inventory.
If you want to create a webpage, use the steps given in the link below and create a php webpage on your own using excel as a backend database, the data which was exported in the above steps can be used as database for this web application
https://smallbusiness.chron.com/populate-website-excel-database-43872.html