[mediacapture-handle] PR Preview doesn't appear to support multiple documents. (#29)

jan-ivar has just created a new issue for https://github.com/w3c/mediacapture-handle:

== PR Preview doesn't appear to support multiple documents. ==
Our first wrinkle with the split into two documents: [PR Preview](https://github.com/tobie/pr-preview) says we _"must add a configuration file to the root of your repository"_.

STR: I pushed [.pr-preview.json](https://github.com/w3c/mediacapture-handle/blob/main/.pr-preview.json) and then rebased https://github.com/w3c/mediacapture-handle/pull/28 but no Preview appeared. I could probably fix it like this:
```json
{
  "src_file": "actions/index.html",
  "type": "respec"
}
```
...but then editors would  have to change it back and forth, which doesn't seem worth it:
```json
{
  "src_file": "identity/index.html",
  "type": "respec"
}
```


Please view or discuss this issue at https://github.com/w3c/mediacapture-handle/issues/29 using your GitHub account


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