feat: Add VitePress docs, EPUB to PDF tool, Phosphor icons, and licensing updates

- Set up VitePress documentation site (docs:dev, docs:build, docs:preview)
- Added Getting Started, Tools Reference, Contributing, and Commercial License pages
- Created self-hosting guides for Docker, Vercel, Netlify, Cloudflare, AWS, Hostinger, Nginx, Apache
- Updated README with documentation link, sponsors section, and docs contribution guide

- Added EPUB to PDF converter using LibreOffice WASM

- Migrated to Phosphor Icons for consistent iconography

- Added donation ribbon banner on landing page
- Removed 'Like My Work?' section (replaced by ribbon)
- Updated licensing.html with delivery model, AGPL notice, invoicing, and no-refund policy

- Added Commercial License documentation page
- Updated translations table (Chinese added, marked non-English as In Progress)

- Added sponsors.yml workflow for auto-generating sponsor avatars

docs/self-hosting/index.md

@@ -0,0 +1,96 @@
+# Self-Hosting Guide
+
+BentoPDF can be self-hosted on your own infrastructure. This guide covers various deployment options.
+
+## Quick Start with Docker
+
+The fastest way to self-host BentoPDF:
+
+```bash
+docker run -d -p 3000:80 ghcr.io/bentopdf/bentopdf:latest
+```
+
+Or with Docker Compose:
+
+```yaml
+# docker-compose.yml
+version: '3.8'
+services:
+  bentopdf:
+    image: ghcr.io/bentopdf/bentopdf:latest
+    ports:
+      - "3000:80"
+    restart: unless-stopped
+```
+
+```bash
+docker compose up -d
+```
+
+## Building from Source
+
+```bash
+# Clone and build
+git clone https://github.com/bentopdf/bentopdf.git
+cd bentopdf
+npm install
+npm run build
+
+# The built files are in the `dist` folder
+```
+
+## Configuration Options
+
+### Simple Mode
+
+Simple Mode is designed for internal organizational use where you want to hide all branding and marketing content, showing only the essential PDF tools.
+
+**What Simple Mode hides:**
+- Navigation bar
+- Hero section with marketing content
+- Features, FAQ, testimonials sections
+- Footer
+- Updates page title to "PDF Tools"
+
+```bash
+# Build with Simple Mode
+SIMPLE_MODE=true npm run build
+
+# Or use the pre-built Docker image
+docker run -p 3000:8080 bentopdf/bentopdf-simple:latest
+```
+
+See [SIMPLE_MODE.md](https://github.com/bentopdf/bentopdf/blob/main/SIMPLE_MODE.md) for full details.
+
+### Base URL
+
+Deploy to a subdirectory:
+
+```bash
+BASE_URL=/pdf-tools/ npm run build
+```
+
+## Deployment Guides
+
+Choose your platform:
+
+- [Vercel](/self-hosting/vercel)
+- [Netlify](/self-hosting/netlify)
+- [Cloudflare Pages](/self-hosting/cloudflare)
+- [AWS S3 + CloudFront](/self-hosting/aws)
+- [Hostinger](/self-hosting/hostinger)
+- [Nginx](/self-hosting/nginx)
+- [Apache](/self-hosting/apache)
+- [Docker](/self-hosting/docker)
+
+## System Requirements
+
+| Requirement | Minimum |
+|-------------|---------|
+| Storage | ~500 MB (with all WASM modules) |
+| RAM | 512 MB |
+| CPU | Any modern processor |
+
+::: tip
+BentoPDF is a static site—there's no database or backend server required!
+:::