Move "Custom Tooling and Dogfooding" section to Developer Experience handbook
Context
The "Custom Tooling and Dogfooding" section was initially written for Development Analytics but is applicable to the broader Developer Experience.
What's in this MR?
- Moves the "Custom Tooling and Dogfooding" section from
/handbook/engineering/infrastructure-platforms/developer-experience/development-analyticsto/handbook/engineering/infrastructure-platforms/developer-experience
Closes gitlab-org/gitlab#573047
Edited by David Dieulivol