Broken links and outdated information on landing page

On the landing page there are some links which are broken or point to wrong location.

- Page not existing: To start working with bazel in the SCORE project, you should check this [introduction page](https://github.com/eclipse-score/blob/main/README.md).
- Outdated and wrong link: Please be aware, that this roadmap will be also transfered to the [GitHub project](https://github.com/orgs/eclipse-score/projects/1). Please follow this link to get the latest state of the planning.
- Outdated: We plan to start regular exchange in the scope of the SCORE project in December 2024.
- Broken links:
- we follow a strict [feature roadmap and architecture](https://eclipse-score.github.io/score/score_releases/index.html#releases)
- and a [rigid software development process](https://eclipse-score.github.io/score/process/index.html#process-description) (currently under development).
- All work in SCORE will therefore follow a [Contribution Request Guideline](https://eclipse-score.github.io/score/process/guidance/contribution_request/index.html).
- contributions via the contribution request process described in the [SCORE project handbook](https://eclipse-score.github.io/score/platform_management_plan/project_management.html).

Additionally, some areas call it SCORE and others S-Core.