Create "KI Hub in numbers" public-facing section

Build a public section on KI Hub that shows organisational reach and usage — supporting stakeholder trust and demonstrating impact.

The issue does not identify files, tests, entry points, metrics, or visual requirements. Start by locating the existing public-facing page structure and clarify which organisational and usage figures should be shown, where their data comes from, and how the section should look. Done means the agreed metrics are publicly displayed and verified in the relevant page or test.

Written by the indexing model from the issue text.