chore: update video uploadig contribution guidelines

Author: f-hollow

content/pages/contribution-guide/writing-content/index.md

@@ -227,7 +227,9 @@ For example, a Mermaid diagram is used on [this page](../contrib-workflow "Contr
 
 ### Video
 
-To embed a YouTube video in your article, use the [Hugo shortcode](https://gohugo.io/content-management/shortcodes/#youtube).
+To embed a video in your article, upload it to a video streaming platform such as YouTube and use the [YouTube shortcode](https://gohugo.io/content-management/shortcodes/#youtube) provided by Hugo to include it in your content. If you don't have your own YouTube channel, we can upload your video to ours.
+
+If you give your consent and share the video file with us, we can also upload it to BiliBili to make it accessible in more geographic areas.
 
 
 ## Use pre-commit

layouts/shortcodes/bilibili-note.html

@@ -1,4 +1,4 @@
 {{ $id := .Get 0 }}
 <p style="margin-top: 0.1em; margin-bottom: -1.5em; font-size: 0.9em; color: gray; text-align: right; margin-right: 0.3em;">
-(Also available on <a href="https://www.bilibili.com/video/{{ $id }}" target="_blank" rel="noopener">BiliBili</a>)
+(also available on <a href="https://www.bilibili.com/video/{{ $id }}" target="_blank" rel="noopener">BiliBili</a>)
 </p>