Add documentation for all PDF tools

docs/tools/delete-pages.md

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+---
+title: Delete Pages
+description: Remove specific pages from a PDF by page number, range, or visual thumbnail selection.
+---
+
+# Delete Pages
+
+Remove unwanted pages from a PDF document. Specify pages to delete by typing page numbers or ranges, or click directly on page thumbnails to mark them for removal.
+
+## How It Works
+
+1. Upload a PDF file. The tool renders thumbnail previews of every page.
+2. Enter the pages to delete in the text field using range syntax (e.g., `2, 5-8`), or click thumbnails to toggle them.
+3. Marked pages are visually highlighted so you can confirm your selection.
+4. Click the process button. A new PDF is created with the selected pages removed.
+
+## Features
+
+- Text-based page selection with range syntax (`2, 5-8, 12`)
+- Visual thumbnail grid for click-to-select deletion
+- Real-time preview highlighting of pages marked for deletion
+- Input validation against the actual page count
+- Keeps all non-deleted pages in their original order
+
+## Use Cases
+
+- Removing blank or filler pages from a scanned document
+- Stripping cover pages or appendices before sharing a document
+- Cleaning up draft pages that were accidentally left in a final PDF
+- Removing pages with sensitive information before distribution
+
+## Tips
+
+- Deleting pages does not affect the remaining pages' content or formatting. The output is a faithful copy of the original minus the removed pages.
+- If you want to keep only specific pages rather than removing specific ones, [Extract Pages](./extract-pages) is the better fit.
+- The thumbnail view loads lazily, so large documents stay responsive.
+
+## Related Tools
+
+- [Extract Pages](./extract-pages)
+- [Organize & Duplicate](./organize-pdf)
+- [Split PDF](./split-pdf)