find alternative font or embed font as base64 into the plugin css

[GottZ]

https://github.com/adifyr/obsidian-chat-view/blob/79f331583593a6d23015d4a8753961b3c73d4f67/styles.css#L1

Refused to load the stylesheet 'https://unpkg.com/[email protected]/dist/katex.min.css' because it violates the following Content Security Policy directive: "style-src 'unsafe-inline' 'self' https://fonts.googleapis.com". Note that 'style-src-elem' was not explicitly set, so 'style-src' is used as a fallback.

in general, relying on resources outside the application window is not really recommended.