Implementing some @julien-deramond remarks.
PR content:
Unused attributes (https://github.com/twbs/bootstrap/pull/36425/commits/5e92c4c1ed13f604b44c7de8f56b4db621ea5f3e)
Since the .bi gives some attributes to the svg in doc, I removed the unused ones that couldn't be there.
Use utilities (https://github.com/twbs/bootstrap/pull/36425/commits/46c8a9a4a32b1b106e40f6a370ed9ea4b3f79d30)
Instead of adding some new CSS rules, use the utilities mt-0 me-0
Unused class (https://github.com/twbs/bootstrap/pull/36425/commits/5cf10f2766f220653b2f1aa909032c1f8a94eca9)
Removed .masthead-followup-svg that is no longer used in Bootstrap.
StackBlitz (https://github.com/twbs/bootstrap/pull/36425/commits/a96d843f9c22ae4c415c82f80190444c9aca5e98)
Reajust the aria-label of the StackBlitz button + removed space