[Observability] Remove EEM docs (#2058)

the PR closes #1834 and removes the EEM docs as the feature no longer
exists.

Author: mdbirnstiehl

redirects.yml

@@ -46,7 +46,6 @@ redirects:
   'solutions/observability/apps/service-map.md': 'solutions/observability/apm/service-map.md'
   'solutions/observability/apps/service-overview.md': 'solutions/observability/apm/service-overview.md'
   'solutions/observability/apps/mobile-service-overview.md': 'solutions/observability/apm/mobile-service-overview.md'
-  'solutions/observability/apps/inventory.md': 'solutions/observability/apm/inventory.md'
   'solutions/observability/apps/drill-down-into-data.md': 'solutions/observability/apm/drill-down-into-data.md'
   'solutions/observability/apps/transactions-2.md': 'solutions/observability/apm/transactions-ui.md'
   'solutions/observability/apps/trace-sample-timeline.md': 'solutions/observability/apm/trace-sample-timeline.md'

reference/observability/elastic-entity-model.md

@@ -1,4 +1,3 @@
 toc:
   - file: index.md
-  - file: fields-and-object-schemas.md
-  - hidden: elastic-entity-model.md
+  - file: fields-and-object-schemas.md

reference/observability/toc.yml

@@ -152,7 +152,6 @@ toc:
                       - file: observability/apm/service-map.md
                       - file: observability/apm/service-overview.md
                       - file: observability/apm/mobile-service-overview.md
-                  - hidden: observability/apm/inventory.md
                   - file: observability/apm/drill-down-into-data.md
                     children:
                       - file: observability/apm/transactions-ui.md