Support page-break-before: always to avoid blank pages caused by page-break-after

The html-to-docx converter currently supports: page-break-after: always

but ignores: page-break-before: always

Microsoft Word itself supports both properties, and this limitation makes accurate pagination difficult when converting HTML to DOCX.

Problem

When using page-break-after: always as a workaround for missing page-break-before support, blank pages can appear in the generated Word document.

This typically happens when a break is applied after the last element of a page. As a result, Word renders an unintended empty page.

Supporting page-break-before would Avoid unintended blank pages.