feat: astro-font - optimize fonts & prevent CLS

[rishi-raj-jain]

Astro Font: https://www.launchfa.st/blog/building-astro-font

Changes

This PR integrates astro-font which automatically generates the fallback font and pass it as the CSS Variable.

[satnaing]

Your integration seems to eliminate render-blocking font resource from the site. Great! Just made a comment on the fallback section. Apart from that, everything's good.

[rishi-raj-jain]

Oh alright, sure I'm adding monospace.

[rishi-raj-jain]

Done, ready for your review, @satnaing.