feat: support mermaid

[Innei]

WHAT

🤖 Generated by Copilot at 5ad9213

Added support for mermaid diagrams in markdown articles. Used a remark plugin to convert mermaid code blocks to HTML divs and a custom hook to load and render the mermaid library. Created new files src/hooks/useMermaid.ts, src/lib/load-script.ts, and src/markdown/remark-mermaid.ts for these functionalities.

🤖 Generated by Copilot at 5ad9213

We load the scripts of doom from the dark CDN
We use the hooks of power to render the mermaid
We transform the code blocks with the remark plugin
We unleash the diagrams of glory in the markdown

WHY

support mermaid

HOW

🤖 Generated by Copilot at 5ad9213

• Define and use useMermaid hook to render mermaid diagrams in markdown content (link, link, link, link, link)
• Import and apply remarkMermaid plugin to transform mermaid code blocks into HTML divs (link, link, link)
• Add empty line for formatting in src/markdown/index.ts (link)

[Innei]

closes #271.

[vercel]

@Innei is attempting to deploy a commit to the RSS3 Team on Vercel.

A member of the Team first needs to authorize it.

[Innei]

[Innei]

Also support dark mode!

[DIYgod]

This is awesome, thank you for your excellent contribution.

Furthermore, I have fixed the issue of ID conflicts when dealing with multiple mermaids and made error handling in 6f43482