docs: split Structure into six linked department pages

docs/organization/structure/hr-administration.mdx

@@ -0,0 +1,20 @@
+---
+title: HR & Administration
+pagination_prev: structure/finance-accounting
+pagination_next: collaboration
+description: HR & Administration purpose, teams and responsibilities in Eldorado’s operating model.
+---
+
+**Purpose:** help teams attract, develop and retain people and provide an effective working environment.
+
+**People & Administration Squad** delivers the department’s responsibilities across the following workstreams.
+
+| Workstream | Responsibilities |
+| --- | --- |
+| Talent Acquisition | Recruitment, candidate experience, hiring coordination and workforce demand support. |
+| People Operations | Employee onboarding, development, performance processes, policies and employee experience. |
+| Office & Administration | Workplace services, office operations and administrative coordination. |
+
+HR partners with department leaders on team capacity and development. People Operations works with Platform & IT on employee onboarding, role changes and offboarding.
+
+[Return to Structure overview](../structure.mdx)