Vscode-docs: Update isort5 upgrade guide link

[karrtikr]

Apologies, looks like the older link to isort5 upgrade guide is suddenly no longer valid. I have made a aka.ms to point to the new link. Can you update to the new link instead: https://aka.ms/AA9j5x4

_Originally posted by @karrtikr in https://github.com/microsoft/vscode-docs/issues/3928#issuecomment-684603518_

[gregvanl]

Hi @karrtikr Do you also want to point https://github.com/timothycrosley/isort#configuring-isort to a documentation page as well?That link for configuration is not 404ing but just goes to the root of the repo.

[gregvanl]

Fix the upgrade link with https://github.com/microsoft/vscode-docs/commit/f4ca2c7e2db199fc1452977be78cf875f8c7987e

[karrtikr]

Do you also want to point https://github.com/timothycrosley/isort#configuring-isort to a documentation page as well?

No that's fine. Just this one, thanks!

[gregvanl]

Wouldn't it be better to point to https://pycqa.github.io/isort/docs/configuration/config_files than the root of the repo?

[karrtikr]

I think you're right, I missed that the section no longer exists on github root. I have created the aka.ms link for that too so we can use that: https://aka.ms/AA9j6k4

[JoshuaPartlow]

@gregvanl - thanks Greg! much appreciated.