feat: make og images an emitter to properly await image generation (#1826)

* checkpoint

* make emitters async generators

* fix

* custom font spec

* replace spinner, use disk cache for fonts

* use readline instead

* make og images look nice

quartz/plugins/transformers/frontmatter.ts

@@ -131,6 +131,7 @@ declare module "vfile" {
         created: string
         published: string
         description: string
+        socialDescription: string
         publish: boolean | string
         draft: boolean | string
         lang: string