Revert "std.SinglyLinkedList: add sort function"

This reverts commit 8b10970836480a43a3bbb1276cb258c2a8b613f2.

This implementation has the following problems:

* It does not provide context to the less than function. This will be an
  API break in order to fix.
* It uses recursion, causing unbounded stack memory usage - likely
  depending on user input, which is extra problematic.
* Sorting linked lists is generally an inefficient operation;
  encouraging it by having a standard library function for it may
  lead to suboptimal software being written in Zig.

Furthermore, there is almost no benefit to providing a sort function as
a method, when a third party implementation can easily be passed a
linked list to then be sorted.

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