Move snippets to the snippets location

[mairaw]

The snippets that were migrated were put in subfolders inside the content and broken down in several small snippets.
In order to get CI working and all, our snippet files need to be moved as a whole (like the original ones) to the snippets folder.

Query to find out how many are still left:
https://github.com/dotnet/docs/search?q=codesnippet&unscoped_q=codesnippet

[pkulikov]

@mairaw please update the link to the snippets folder, as it's different after the repo split.

[mairaw]

Done @pkulikov. Thanks!