Add documentation for all PDF tools

docs/tools/pub-to-pdf.md

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+---
+title: PUB to PDF
+description: Convert Microsoft Publisher (PUB) files to PDF in your browser. Free, private, no software needed.
+---
+
+# PUB to PDF
+
+Convert Microsoft Publisher files into PDF. Publisher is a desktop publishing tool bundled with some editions of Microsoft Office, but most people don't have it installed. This tool lets anyone convert PUB files to PDF directly in the browser, no Microsoft software required.
+
+## Supported Formats
+
+| Format              | Extension | Notes                        |
+| :------------------ | :-------- | :--------------------------- |
+| Microsoft Publisher | `.pub`    | Desktop publishing documents |
+
+## How It Works
+
+1. Click the upload area or drag and drop your PUB files. Multiple files can be uploaded at once.
+2. Review the file list. Remove unwanted files with the trash icon, or click **Add More Files** to add more.
+3. Click **Convert to PDF**. A LibreOffice-based engine loads in the browser and converts each PUB file, preserving layout, images, and text boxes.
+4. One file downloads as a PDF directly. Multiple files are delivered in a ZIP archive named `pub-to-pdf.zip`.
+
+## Options
+
+No additional configuration is needed. The converter handles the PUB layout engine automatically.
+
+## Use Cases
+
+- Opening a PUB flyer or newsletter from a client without buying Microsoft Publisher
+- Converting church bulletins, event programs, or school newsletters created in Publisher
+- Archiving marketing materials from Publisher in a universally accessible format
+- Printing PUB files on a system that doesn't have Publisher installed
+
+## Tips
+
+- Complex Publisher layouts with layered text boxes and precise positioning may shift slightly during conversion. Review the output if exact positioning is critical.
+- The LibreOffice engine initializes once per session. The first conversion takes longer; subsequent ones are faster.
+- For the most faithful conversion of Publisher files, ensure any custom fonts used in the original are standard system fonts.
+
+## Related Tools
+
+- [VSD to PDF](./vsd-to-pdf)
+- [ODP to PDF](./odp-to-pdf)