refactor the folder structure (Azure#37203)

Co-authored-by: ZiWei Chen <98569699+kazrael2119@users.noreply.github.com>
Co-authored-by: Qiaoqiao Zhang <55688292+qiaozha@users.noreply.github.com>

Author: 3 people

…/devspaces/resource-manager/readme.go.md …crosoft.DevSpaces/DevSpaces/readme.go.mdspecification/devspaces/resource-manager/readme.go.md renamed to specification/devspaces/resource-manager/Microsoft.DevSpaces/DevSpaces/readme.go.md specification/devspaces/resource-manager/readme.go.md renamed to specification/devspaces/resource-manager/Microsoft.DevSpaces/DevSpaces/readme.go.md

@@ -36,7 +36,7 @@ These settings apply only when `--tag=package-2019-04-01` is specified on the co
 
 ``` yaml $(tag) == 'package-2019-04-01'
 input-file:
-- Microsoft.DevSpaces/stable/2019-04-01/devspaces.json
+- stable/2019-04-01/devspaces.json
 ```