perf: incremental rebuild (--fastRebuild v2 but default) (#1841)

* checkpoint

* incremental all the things

* properly splice changes array

* smol doc update

* update docs

* make fancy logger dumb in ci

quartz/util/ctx.ts

@@ -1,12 +1,12 @@
 import { QuartzConfig } from "../cfg"
-import { FullSlug } from "./path"
+import { FilePath, FullSlug } from "./path"
 
 export interface Argv {
   directory: string
   verbose: boolean
   output: string
   serve: boolean
-  fastRebuild: boolean
+  watch: boolean
   port: number
   wsPort: number
   remoteDevHost?: string
@@ -18,4 +18,8 @@ export interface BuildCtx {
   argv: Argv
   cfg: QuartzConfig
   allSlugs: FullSlug[]
+  allFiles: FilePath[]
+  incremental: boolean
 }
+
+export type WorkerSerializableBuildCtx = Omit<BuildCtx, "cfg">