Remove lang-based redirect for now

[rayangler]

Current Behavior:

Server docs

Staging Links:

Server docs

Notes:

• Removing usage of this script for now due to user feedback about not knowing how to switch back to English site through the locale selector. The plan is to re-enable this feature again once DOP-4715 is unblocked and fully functional so that users can have the locale selector more visible on the top nav.
• To test on the staging link, make sure to remove preferred_locale from local storage if it is set to en-us and set a browser language to a supported language like Portuguese (make sure it's the primary language, above English). The staging link should not cause a redirect.

README updates

• • This PR introduces changes that should be reflected in the README, and I have made those updates.
• • This PR does not introduce changes that should be reflected in the README