Provide Swagger UI on Github Pages

[mkanal]

As a external contributor ,
I want a Swagger UI on GitHub Pages,
so that I have a detailed overview of provided APIs and are able to download the OpenApi specification.

Link

• Provide auto. Versioning of API and publish API to SwaggerHub #418

Hints / Details

• It is not possible to publish our API on SwaggerHub because there are already three APIs published (Provide auto. Versioning of API and publish API to SwaggerHub #418). This is the maximum amount in the free tier. Tractus-X is not planning to upgrade it. Therefore, we have to find an alternative to SwaggerHub. A proposed alternative are the GitHub Pages for each project. (https://eclipse-tractusx.github.io/traceability-foss/docs/)
• An example on how to achieve that, can be found in the EDC repository: https://github.com/eclipse-edc/.github/blob/main/.github/workflows/publish-openapi-ui.yml

Acceptance Criteria

• Swagger UI is available in the IRSGitHub Pages: https://eclipse-tractusx.github.io/item-relationship-service/docs/
• KIT documentation must be updated

Out of Scope

• ...

[ds-jhartmann]

Planning 2:

• take a look at how the EDC team did this and re-use it, if possible

[ds-ext-kmassalski]

Swagger-UI is now available under:
https://eclipse-tractusx.github.io/item-relationship-service/docs/

KIT update PR:
eclipse-tractusx/eclipse-tractusx.github.io#861

[mkanal]

@jzbmw Ready for review - swagger ui is present and KIT update was made