Add link to Contributor and Development Docs

What does this MR do?

This MR adds a new link to the Contributor and Development Docs page in the Other GitLab Development Kit (GDK) guides section. This link goes to the GDK page with the setup for running interactive terminals from the Web IDE.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• [-] Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Ref: #211776 (closed)