Custom unresponsive message and parameters for timed out website

Target URL: ```https://img.shields.io/website/http/```
The status image takes too long to load for unresponsive websites. Therefore, here are the suggestions:
```timeout=``` (try x seconds before showing unresponsive message)
```unresponsive_message=```
I love this project!
Thank you very much.

Start with the website badge endpoint at https://img.shields.io/website/http/ and trace how it handles an unresponsive target URL. Check the existing timeout behavior and request parameters; done means timeout and unresponsive_message are accepted and produce the requested response for slow or unresponsive websites.

Written by the indexing model from the issue text.