base path refactor to better support subpath hosting

quartz/worker.ts

@@ -2,12 +2,12 @@ import sourceMapSupport from "source-map-support"
 sourceMapSupport.install(options)
 import cfg from "../quartz.config"
 import { Argv, BuildCtx } from "./util/ctx"
-import { FilePath, ServerSlug } from "./util/path"
+import { FilePath, FullSlug } from "./util/path"
 import { createFileParser, createProcessor } from "./processors/parse"
 import { options } from "./util/sourcemap"
 
 // only called from worker thread
-export async function parseFiles(argv: Argv, fps: FilePath[], allSlugs: ServerSlug[]) {
+export async function parseFiles(argv: Argv, fps: FilePath[], allSlugs: FullSlug[]) {
   const ctx: BuildCtx = {
     cfg,
     argv,