feat(export): native DOCX export via html-to-docx (opt-in)

doc/docker.md

@@ -197,7 +197,7 @@ For the editor container, you can also make it full width by adding `full-width-
 | `EDIT_ONLY`                       | Users may edit pads but not create new ones. Pad creation is only via the API. This applies both to group pads and regular pads.                                                                       | `false`               |
 | `MINIFY`                          | If true, all css & js will be minified before sending to the client. This will improve the loading performance massively, but makes it difficult to debug the javascript/css                           | `true`                |
 | `MAX_AGE`                         | How long may clients use served javascript code (in seconds)? Not setting this may cause problems during deployment. Set to 0 to disable caching.                                                      | `21600` (6 hours)     |
-| `SOFFICE`                         | Absolute path to the soffice (LibreOffice) executable. Needed for advanced import/export of pads (docx, pdf, odt). Setting it to null disables LibreOffice and will only allow plain text and HTML import/exports. | `null`                |
+| `SOFFICE`                         | Absolute path to the soffice (LibreOffice) executable. When configured, all advanced import/export formats use it (docx, pdf, odt, doc, rtf). Setting it to null falls back to in-process pure-JS converters: docx and pdf export, plus docx import, still work; odt/doc/rtf and pdf import remain unavailable. | `null`                |
 | `ALLOW_UNKNOWN_FILE_ENDS`         | Allow import of file types other than the supported ones: txt, doc, docx, rtf, odt, html & htm                                                                                                         | `true`                |
 | `REQUIRE_AUTHENTICATION`          | This setting is used if you require authentication of all users. Note: "/admin" always requires authentication.                                                                                        | `false`               |
 | `REQUIRE_AUTHORIZATION`           | Require authorization by a module, or a user with is_admin set, see below.                                                                                                                             | `false`               |