chore(docs): update README.md

README.md

@@ -70,11 +70,48 @@ All commands are run from the root of the project, from a terminal:
 - [x] Better support for printing version
 - [ ] Add support for more comment engines
 - [x] Add support for umami statics
-- [ ] Improve documentation
+- [x] Improve documentation
 - [ ] Release v1.0
 - [ ] ~~Integrate with Fediverse w/ activityPub~~
 - [ ] ~~Plain text version when visiting the site via `curl`~~ (can't be done with SSG mode)
 
+## ⚙️ Advanced Usage
+### i18n
+I have implemented i18n support for UI text, but not for content translations yet.
+
+To further implement i18n, you can:
+1. Create a new folder under `src/content/posts/` with the language code as the name (e.g., `en`, `zh-CN`, etc.).
+2. Copy your translated markdown files into the new folder.
+3. Copy the `src/pages/blog/` folder to `src/pages/[langcode]/blog`.
+4. Update the i18n config in `astro.config.mjs` to include the new language code.
+5. Rebuild the site.
+### plain text version when visiting the site via `curl`
+The text version of the site is generated by `src/pages/blog/[slug].txt.js`, which outputs a plain text version of the blog post.
+To access it, you can visit `https://your-site.com/blog/your-post-slug.txt`.
+
+To automatically output the text version when visiting the site via `curl`, you can:
+1. If you are using caddy, add the following to your `Caddyfile`:
+   ```caddyfile
+   @curl {
+        header_regexp User-Agent (?i)curl 
+   }
+   @text {
+        path_regexp text /blog/(.*)
+   }
+   handle @curl {
+        rewrite @text /blog/{http.regexp.text.1}.txt
+   }
+   ```
+2. If you are using cloudflare to proxy your site, you can add a page rule to redirect requests with the `curl` user agent to the `.txt` version of the blog post:
+   If incoming requests match (Custom filter expression):
+   ```
+   (http.request.full_uri wildcard r"https://yourblog/blog/*" and http.user_agent contains "curl")
+   ```
+   Then (Rewrite to,static):
+   ```
+    /blog/${1}.txt
+   ```
+3. If you are using other web servers, you can use functions like `rewrite` or `redirect` by user agent (HTTP header) to achieve the same effect.
 ## 👀 Want to learn more?
 
 See the post [🕊](). I hope you like it. 💜
@@ -88,6 +125,6 @@ Other tools like GitHub Copilot helps too.
 
 (I know the LLMs sometimes sucks, but it really helps most of the time)
 
-Also [delucis/astro-blog-full-text-rss](https://github.com/delucis/astro-blog-full-text-rss) for implementing full text RSS in pretty easy way
+Also, [delucis/astro-blog-full-text-rss](https://github.com/delucis/astro-blog-full-text-rss) for implementing full text RSS in pretty easy way.
 ## ⚖️ License
 GNU Affero Public License 3.0