Add documentation for all PDF tools

docs/tools/table-of-contents.md

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+---
+title: Table of Contents
+description: Generate a formatted table of contents page from your PDF's existing bookmarks.
+---
+
+# Table of Contents
+
+This tool reads the bookmarks (outlines) in your PDF and generates a formatted table of contents page that gets prepended to the document. If your PDF already has bookmarks but lacks a visible TOC page, this tool creates one automatically.
+
+## How It Works
+
+1. Upload a PDF that contains bookmarks.
+2. Customize the TOC title, font size, and font family.
+3. Optionally check **Add bookmark for TOC page** to include the TOC itself in the bookmark tree.
+4. Click **Generate Table of Contents** to process the file.
+5. The updated PDF downloads automatically with the TOC page inserted at the beginning.
+
+## Options
+
+- **TOC Title** -- The heading displayed at the top of the generated page. Defaults to "Table of Contents".
+- **Font Size** -- Choose from 10pt to 72pt. The default is 12pt.
+- **Font Family** -- Select from Times Roman, Helvetica, or Courier variants (regular, bold, italic, bold italic). Defaults to Helvetica.
+- **Add bookmark for TOC page** -- When checked, a bookmark entry for the TOC page itself is added to the PDF's outline tree.
+
+## Features
+
+- Reads the full bookmark hierarchy from the PDF
+- Generates a cleanly formatted TOC page with page number references
+- Supports nested bookmark levels with indentation
+- Choice of 12 built-in PDF fonts
+- Optional self-referencing bookmark for the TOC page
+
+## Use Cases
+
+- Adding a printable table of contents to e-books or reports that only have digital bookmarks
+- Creating a TOC for a merged document after combining multiple PDFs
+- Generating a reference page for long technical manuals
+- Preparing documents for print where a visible TOC is expected
+
+## Tips
+
+- If your PDF has no bookmarks, use the [Edit Bookmarks](./bookmark) tool first to create them, then come back here to generate the TOC.
+- For large documents, a bigger font size like 14pt or 16pt improves readability.
+
+## Related Tools
+
+- [Edit Bookmarks](./bookmark)
+- [Page Numbers](./page-numbers)
+- [Header & Footer](./header-footer)