This commit refactors the `usageStatisticsEnabled` setting from a sub-property of the `telemetry` configuration to a top-level setting. This change simplifies the configuration by decoupling usage statistics from the telemetry settings.
The documentation has also been updated to reflect this change.
Moves the telemetry.md file from docs/core to the top-level docs/ directory to make it more discoverable.
Updates the link in the main index.md and removes the old reference from the CLI configuration page.
