Build CSS against bundle instead of source

To reduce the size of our CSS by not including CSS for unused styles, we should build our CSS (tailwind) against bundled code instead of source. This involves updating the `content` globs in tailwind configuration modules and potentially re-ordering build tasks.

Note: Don't forget to update the "Getting Started" documentation in the pattern library (`frontend-shared`), which references Tailwind content globs and may be obsolesced by these changes.