Configurable ipfs-check URL

[lidel]

#469 introduced

ipld-explorer-components/src/components/explore/IpldExploreErrorComponent.tsx

Line 27 in 4d02893

href={`https://check.ipfs.network/?cid=${cid}`}

The URL should be something that can be customized by user.

Main reason is that the checker URL is configurable in ipfs-webui since ipfs/ipfs-webui#2392, but still hardcoded here.
Webui should use URL from settings, if user chose to run own.