Broken link to Adobe Sign workflow samples?

Hi - I'd like to look at the sample workflows for Adobe Sign but when I click on the link (Adobe Sign API > API Information > "REST API samples which showcase common workflows") which goes to https://opensource.adobe.com/dc-acrobat-sdk-docs/adobesignsdk/index.html I get this message

404
File not found

The site configured at this address does not contain the requested file.

Anyone know where it can be found?

EM