Remove support for Environments

MANIFEST.in

@@ -8,6 +8,5 @@ include test-requirements.txt
 include src/prefect/_version.py
 include src/prefect/_siginfo.py
 include src/prefect/_sig29/*.txt
-graft src/prefect/environments
 graft src/prefect/agent
 graft src/prefect/tasks/aws/waiters

docs/.vuepress/config.js

@@ -132,11 +132,6 @@ module.exports = {
           collapsable: true,
           children: getChildren('docs/api/latest', 'engine')
         },
-        {
-          title: 'prefect.environments',
-          collapsable: true,
-          children: getChildren('docs/api/latest', 'environments')
-        },
         {
           title: 'prefect.executors',
           collapsable: true,
@@ -244,7 +239,6 @@ module.exports = {
             'agents/docker',
             'agents/kubernetes',
             'agents/ecs',
-            'agents/fargate'
           ]
         },
         {
@@ -299,20 +293,6 @@ module.exports = {
           collapsable: true,
           children: getChildren('docs/orchestration', 'faq')
         },
-        {
-          title: 'Legacy Environments',
-          collapsable: true,
-          children: [
-            'execution/overview',
-            'execution/storage_options',
-            'execution/local_environment',
-            'execution/dask_cloud_provider_environment',
-            'execution/dask_k8s_environment',
-            'execution/k8s_job_environment',
-            'execution/fargate_task_environment',
-            'execution/custom_environment'
-          ]
-        }
       ],
       '/core/': [
         '/core/',