Expose fit-to-width at polylux level

Author: ntjess

polylux.typ

@@ -2,4 +2,4 @@
 #import "logic.typ"
 #import "logic.typ": polylux-slide, uncover, only, alternatives, alternatives-match, alternatives-fn, alternatives-cases, one-by-one, line-by-line, list-one-by-one, enum-one-by-one, terms-one-by-one, pause, enable-handout-mode
 #import "utils/utils.typ"
-#import "utils/utils.typ": polylux-outline, fit-to-height, side-by-side, pdfpc
+#import "utils/utils.typ": polylux-outline, fit-to-height, fit-to-width, side-by-side, pdfpc