Plainwhite astro porting

[edge33]

I have recently migrated the theme for use in Astro. This work has been undertaken as a token of gratitude to the original author and the contributors. I hope the community appreciates and loves the theme as much as I do, and that it inspires them to create great things with it.

https://github.com/edge33/plainwhite-astro

[samarsault]

@edge33 This looks amazing. Thanks for the appreciation!