Pdf to markdown (#2730)

# Description

Please provide a summary of the changes, including relevant motivation
and context.

Closes #(issue_number)

## Checklist

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have performed a self-review of my own code
- [ ] I have attached images of the change if it is UI based
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [ ] My changes generate no new warnings
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

---------

Co-authored-by: a <a>

src/main/resources/templates/home.html

@@ -192,6 +192,9 @@
               <div
                 th:replace="~{fragments/card :: card(id='pdf-to-book', cardTitle=#{home.PDFToBook.title}, cardText=#{home.PDFToBook.desc}, cardLink='pdf-to-book', toolIcon='book', tags=#{PDFToBook.tags}, toolGroup='convert')}">
               </div>
+              <div
+                th:replace="~{fragments/card :: card(id='pdf-to-markdown', cardTitle=#{home.PDFToMarkdown.title}, cardText=#{home.PDFToMarkdown.desc}, cardLink='pdf-to-markdown', toolIcon='markdown_copy', tags=#{PDFToMarkdown.tags}, toolGroup='convert')}">
+              </div>
             </div>
           </div>