GitLab

**Description**
Update links of referencing other docs using relative file paths with extensions.

**Description**
Revise results contributing rule.

- Change the results uploading path to [superbench-results](https://github.com/microsoft/superbench-results

) repo.
- Add description of how to get system info by command.
Co-authored-by: Peng Cheng <chengpeng5555@outlook.com>

**Description**
Add result contributing rules

Update SuperBench documents.