Replace deprecated Tidis URL

[tymokvo]

What is changed?

Summary

• Replace Tidis repo URL

Description

The website currently links to yongman/tidis which has a big DEPRECATED warning and points to tidb-incubator/tidis. This replaces the old URL with the new one.

Any related PRs or issues?

None known.

Which version does your change affect?

Semantically, all versions. Practically, none since it's just a reference to another project.