Notice preview does not support Markdown

[WiIIiamWei]

The notice description is written in Markdown yet not rendered.

Either add the support or just change them into plain text would be a good fix.

[Moroshima]

To fix this bug, it may take great efforts to rebuild a render stream based on next-mdx-remote.

[MaxtuneLee]

Since description has no other format but only gray text, it's not recommended to put md in description. I think the best solution is to change description in frontmatter.