v0.15.0

a80f75b chore(deps): Bump setup-ruby version (v3.2)
da0b945 feat(segment): Scrollable segment items (set in init.scss variable $grid-body-height
ad9b7c7 refactor(symbols): Making material-symbols-outlined a variable (acc.icon_class)
d3ce83b refactor(sass): Switch from @include to @use
b509c0d refactor(spec): Explicit list of spec files (remove dep on git)
c59b87c fix(sw): Updated to meet current webmanifest standard (incomplete)