Attach yamlls to yaml.ansible filetypes & show diagnostic source

similiar to lsp source

vars/debian.yml

@@ -16,18 +16,14 @@ neovim:
 
 # TODO: add lua language server, see https://github.com/LuaLS/lua-language-server?
 language_servers:
-  - {
-      package: '@ansible/ansible-language-server',
-      server_name: 'ansiblels',
-      auto_setup: true
-    }
-  - {
-      package: yaml-language-server,
-      server_name: 'yamlls',
-      auto_setup: true
-    }
-  - {
-      package: bash-language-server,
-      server_name: 'bashls',
-      auto_setup: true
-    }
+  - package: '@ansible/ansible-language-server'
+    server_name: 'ansiblels'
+    auto_setup: true
+
+  - package: yaml-language-server
+    server_name: 'yamlls'
+    auto_setup: false
+
+  - package: bash-language-server
+    server_name: 'bashls'
+    auto_setup: true