feat: add homepage to item-relationship-service repo

[almadigabor]

Description

Based on request from IRS team. Fixes https://github.com/eclipse-tractusx/sig-infra/issues/410.

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• [x] DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• [x] Copyright and license header are present on all affected files

[github-actions[bot]]

Diff for 3c76437974429ddc8f16575a5ce33bebec84542c:

```diff Printing local diff: Actions are indicated with the following symbols: + create ! modify ! forced update - delete Organization eclipse-tractusx[id=eclipse-tractusx] there have been 41 validation infos, enable verbose output with '-v' to to display them. ! repository[name="item-relationship-service"] { ! homepage = null -> "https://eclipse-tractusx.github.io/item-relationship-service/docs/" ! } Plan: 0 to add, 1 to change, 0 to delete. ```

Canonical Diff for 3c76437974429ddc8f16575a5ce33bebec84542c:

```diff Showing canonical diff: Organization eclipse-tractusx[id=eclipse-tractusx] ```

[netomi]

change is live.