docs: elixir - Publish documentation in release script

[tobbbles]

Currently, we only publish the package contents to hex.pm, and no documentation.

According to hex publishing documentation https://hex.pm/docs/publish#documentation - we can publish both package and documentation by omitting the package part of the hex.publish command.

Elixir has a really nice online documentation platform under https://hexdocs.pm. By publishing the package and documentation, users will be able to read the generate documentation online, (e.g. at https://hexdocs.pm/ory_kratos/)

Related Issue or Design Document

Checklist

• [X] I have read the contributing guidelines and signed the CLA.
• [ ] I have referenced an issue containing the design document if my change introduces a new feature.
• [X] I have read the security policy.
• [X] I confirm that this pull request does not address a security vulnerability. If this pull request addresses a security vulnerability, I confirm that I got approval (please contact security@ory.sh) from the maintainers to push the changes.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] I have added the necessary documentation within the code base (if appropriate).

Further comments

This should work out of the box, as aeneasr already owns the packages on hex.

[tobbbles]

@aeneasr 🤦 I messed up and nuked the old pull request #249 on accident; my mistake!

I've updated the generator in this PR to 6.2.1 so it picks up the improved documentation changes in https://github.com/OpenAPITools/openapi-generator/pull/13478

I'd suggest tracking and updated to 6.3.0 in a future PR that targets specifically #229

[aeneasr]

Awesome 👍 :)