Update the Stacks website to avoid mentions of Stack Overflow for Teams following the rename

[CoconutMacaroon]

Describe the bug
Stack Overflow Design, also known as Stacks, has a handful of references to Stack Overflow for Teams, which has been renamed to Stack Overflow Internal.

To Reproduce
Steps to reproduce the behavior:

Visit one of these pages:

• https://stackoverflow.design/brand/copywriting/naming/#stack-overflow-for-teams
• https://stackoverflow.design/brand/logo/#stack-overflow-for-teams (that page also needs the updated logo)
• https://stackoverflow.design/email/components/team-identification/

Expected behavior
Those use the updated brand Stack Internal instead of Stack Overflow for Teams.

While I personally prefer Stack Internal, I'm unsure from the announcement if the preferred name is Stack Internal or Stack Overflow Internal.

In a Meta Stack Exchange post, Journeyman Geek also raised some questions about the branding of Stack Internal, including the preferred name for it and what "a Stack Internal instance [is] called", so once Stacks is updated, replying there may be helpful.

[abovedave]

Thank you for this, we have updated guidelines on their way soon!