feat(blog): add reading UX enhancements

- Add reading time estimation (Korean: chars/min, English: words/min)
- Add auto-generated table of contents for posts with 3+ headings
- Add related posts section based on matching tags
- Add prev/next post navigation
- Add reading progress bar at top of page
- Add copy button for code blocks
- Add lazy loading for post images
- Update README with Makefile image conversion usage

Author: ppippi-dev

Makefile

@@ -0,0 +1,40 @@
+# Image conversion Makefile
+# Usage:
+#   make convert    - Convert all images (webp + mp4)
+#   make webp       - Convert PNG/JPG to WebP
+#   make mp4        - Convert GIF to MP4
+#   make clean      - Remove converted files (use with caution)
+
+.PHONY: all convert webp mp4 help clean
+
+# Default target
+all: convert
+
+# Convert all images
+convert: webp mp4
+	@echo ""
+	@echo "=== All conversions complete ==="
+
+# Convert PNG/JPG to WebP
+webp:
+	@echo "=== Converting PNG/JPG to WebP ==="
+	@./scripts/convert-images-to-webp.sh
+
+# Convert GIF to MP4
+mp4:
+	@echo "=== Converting GIF to MP4 ==="
+	@./scripts/convert-gif.sh
+
+# Help
+help:
+	@echo "Image Conversion Makefile"
+	@echo ""
+	@echo "Usage:"
+	@echo "  make convert  - Convert all images (webp + mp4)"
+	@echo "  make webp     - Convert PNG/JPG to WebP only"
+	@echo "  make mp4      - Convert GIF to MP4 only"
+	@echo "  make help     - Show this help"
+	@echo ""
+	@echo "Requirements:"
+	@echo "  - cwebp (brew install webp)"
+	@echo "  - ffmpeg (brew install ffmpeg)"

README.md

@@ -1,62 +1,16 @@
-# Astro Starter Kit: Blog
+# ppippi-dev Blog
 
-```sh
-npm create astro@latest -- --template blog
-```
-
-> 🧑‍🚀 **Seasoned astronaut?** Delete this file. Have fun!
-
-Features:
-
-- ✅ Minimal styling (make it your own!)
-- ✅ 100/100 Lighthouse performance
-- ✅ SEO-friendly with canonical URLs and OpenGraph data
-- ✅ Sitemap support
-- ✅ RSS Feed support
-- ✅ Markdown & MDX support
+## Image Conversion
 
-## 🚀 Project Structure
-
-Inside of your Astro project, you'll see the following folders and files:
-
-```text
-├── public/
-├── src/
-│   ├── components/
-│   ├── content/
-│   ├── layouts/
-│   └── pages/
-├── astro.config.mjs
-├── README.md
-├── package.json
-└── tsconfig.json
+```bash
+make convert  # PNG/JPG -> WebP + GIF -> MP4
+make webp     # PNG/JPG -> WebP
+make mp4      # GIF -> MP4
+make help     # Show help
 ```
 
-Astro looks for `.astro` or `.md` files in the `src/pages/` directory. Each page is exposed as a route based on its file name.
-
-There's nothing special about `src/components/`, but that's where we like to put any Astro/React/Vue/Svelte/Preact components.
-
-The `src/content/` directory contains "collections" of related Markdown and MDX documents. Use `getCollection()` to retrieve posts from `src/content/blog/`, and type-check your frontmatter using an optional schema. See [Astro's Content Collections docs](https://docs.astro.build/en/guides/content-collections/) to learn more.
+### Requirements
 
-Any static assets, like images, can be placed in the `public/` directory.
-
-## 🧞 Commands
-
-All commands are run from the root of the project, from a terminal:
-
-| Command                   | Action                                           |
-| :------------------------ | :----------------------------------------------- |
-| `npm install`             | Installs dependencies                            |
-| `npm run dev`             | Starts local dev server at `localhost:4321`      |
-| `npm run build`           | Build your production site to `./dist/`          |
-| `npm run preview`         | Preview your build locally, before deploying     |
-| `npm run astro ...`       | Run CLI commands like `astro add`, `astro check` |
-| `npm run astro -- --help` | Get help using the Astro CLI                     |
-
-## 👀 Want to learn more?
-
-Check out [our documentation](https://docs.astro.build) or jump into our [Discord server](https://astro.build/chat).
-
-## Credit
-
-This theme is based off of the lovely [Bear Blog](https://github.com/HermanMartinus/bearblog/).
+```bash
+brew install webp ffmpeg
+```