Add documentation for all PDF tools

docs/tools/font-to-outline.md

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+---
+title: Font to Outline
+description: Convert all PDF fonts to vector outlines for consistent rendering across devices. Eliminates font dependency issues.
+---
+
+# Font to Outline
+
+Converting fonts to outlines transforms every text character from a font-based glyph into a vector path. The PDF no longer depends on any installed fonts -- it renders identically on every device, every operating system, and every printer. This is a standard step in prepress workflows.
+
+## How It Works
+
+1. Upload one or more PDF files.
+2. Click **Convert to Outlines**.
+3. Ghostscript converts all text to vector paths.
+4. Download the result. Multiple files produce a ZIP archive.
+
+There are no settings to configure. The tool uses Ghostscript (WebAssembly) to convert all font references to outlined paths in a single pass.
+
+## What Changes
+
+- Text characters become vector curves (bezier paths)
+- Font embedding is no longer necessary -- the PDF is self-contained at the glyph level
+- File size may increase because vector paths are typically larger than font references
+- Visual appearance is preserved exactly
+
+## What You Lose
+
+- Text selection and copy-paste
+- Text searchability (Ctrl+F stops working)
+- The ability to edit text content
+- Screen reader accessibility
+
+## Use Cases
+
+- Sending PDFs to a print shop that requires outlined fonts
+- Sharing documents that use custom or licensed fonts with people who do not have those fonts
+- Preventing font substitution that changes the look of your document on other systems
+- Preparing PDFs for laser engraving or CNC cutting workflows that require vector input
+- Ensuring a logo-heavy PDF displays correctly across all platforms
+
+## Tips
+
+- Keep your original PDF. Outlining is irreversible -- you cannot convert paths back to editable text.
+- If you need the text to remain searchable, consider the Rasterize PDF tool with OCR as a follow-up instead.
+- Outlined PDFs tend to be larger. Run Compress PDF afterward if file size matters.
+
+## Related Tools
+
+- [Flatten PDF](./flatten-pdf) -- flatten forms and annotations without touching fonts
+- [Rasterize PDF](./rasterize-pdf) -- convert to image-based PDF instead of vector outlines
+- [Compress PDF](./compress-pdf) -- reduce file size after outlining
+- [PDF to PDF/A](./pdf-to-pdfa) -- convert for archival after ensuring font independence