chore: dont send source-map to cloudflare

- delete the source map after it has been sent to sentry but before it would be uploaded to cloudflare
- skip building a sourece map in dev
- skip the extracting comments to a license file

builds on #505
may help with #499

License: (Apache-2.0 AND MIT)
Signed-off-by: Oli Evans <oli@tableflip.io>