Disable smooth scrolling by default

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

Remove smooth scrolling introduced in https://github.com/twbs/bootstrap/pull/31877 by setting $enable-smooth-scroll to false by default (or removing completely).

Motivation and context

There were comments in the issue indicating this feature affects negatively several websites

https://github.com/twbs/bootstrap/pull/31877#issuecomment-746670156 https://github.com/twbs/bootstrap/pull/31877#issuecomment-1200475195

as well as external issues

https://github.com/hotwired/turbo-rails/issues/165 https://github.com/jenkins-infra/jenkins.io/issues/6009

The suggested workaround involves overriding this with !important, which is not a good practice.