CSS: Make use of --bs-link-decoration and --bs-link-hover-decoration

[louismaximepiton]

Description

Make use of --bs-link-decoration and --bs-link-hover-decoration in Bootstrap.

Motivation & Context

More flexible for Bootstrap users.

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would change existing functionality)

Checklist

• I have read the contributing guidelines
• My code follows the code style of the project (using npm run lint)
• My change introduces changes to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

Live previews

• https://deploy-preview-39098--twbs-bootstrap.netlify.app/docs/5.3/content/reboot#links
• https://deploy-preview-39098--twbs-bootstrap.netlify.app/docs/5.3/components/buttons

Related issues

Closes #36293.

[mdo]

Approved after suggested change is added

[julien-deramond]

Tagged it as v5.4.0 since it's a new feature non-related to color modes fixes.

[AgentSmith0]

Is it really a new feature? Since the variable was there before, but it was just not used anywhere, so I would say it's more a bug fix.

[julien-deramond]

Fingers are often pointed at us because regarding how we sometimes handle the SemVer. TBH, it's a bit difficult to evaluate what should be in a major, minor, or dot release depending on how advanced is the usage (basic, Sass customization, custom properties advanced usage, etc.).
Regarding this PR I have mixed feelings regarding the fact it's rather a bug fix or a "new feature" (at least an enhancement).
Let it for now for a v5.4.0 waiting for @twbs/css-review thoughts.
Depending on these thoughts, I can prioritize it for the next v5.3.3 to release it sooner.

[jcoyne]

Thank you @louismaximepiton. This is just what I was looking for!

[AgentSmith0]

Is there a new feature release planned soon?

[julien-deramond]

Is there a new feature release planned soon?

It's not planned yet. Release v5.3.3 is soon to be released and we still need to define if there will be a v5.3.4 before the v5.4.0.