refactoring headings sass to include placeholders + automated class-based rules
refactoring headings sass to include placeholders + automated class-based rules

IndonesiaX/ux-pattern-library,edx/ux-pattern-library,IndonesiaX/ux-pattern-library,edx/ux-pattern-library,IndonesiaX/ux-pattern-library,edx/ux-pattern-library