Unable to manage plugin through netlify.toml

Hi,

I enabled this plugin for my Netlify site by following the documentation.

However, I like to manage my plugins and environment variables through my *netlify.toml* file. So, I removed those environment variables and plugin from the Netlify website and added the following to *netlify.toml*:

```
...
ALGOLIA_API_KEY = "..."
ALGOLIA_BASE_URL = "https://crawler.algolia.com"

[[plugins]]
package = "@algolia/netlify-plugin-crawler"
```

On doing so, Algolia removed the crawler after sometime with the following error: *Algolia can no longer access your Netlify Site "...".* This shouldn't have happened, right? Or did I do something wrong?

Start by reviewing the plugin documentation and the reported netlify.toml configuration, including the ALGOLIA_API_KEY and ALGOLIA_BASE_URL variables. Reproduce the setup with the [[plugins]] entry and determine why the crawler becomes inaccessible; done means the plugin can be managed through netlify.toml without being removed.

Written by the indexing model from the issue text.