Define outbase on esbuild

Fixes some weird client placement bugs when using the default layouts and clients.

Author: bcomnes

lib/build-esbuild/index.js

@@ -86,6 +86,7 @@ export async function buildEsbuild (src, dest, siteData, opts) {
     splitting: true,
     sourcemap: true,
     outdir: dest,
+    outbase: src,
     target,
     define,
     metafile: true,