WIP: TEMP-FIX! manually copy payload.js to dist

Problem: The `addDocketCounts` function specifies the name 'payload.js'
as the file that should be executed in the chrome tab when scraping
the page. However, when parcel builds the source files, the dist/ files
all have a unique hash added to them so the file becomes something
like 'payload.89274893.js'. I haven't figured out how to tell parcel
to update this filename though.

Solution: No idea. The problem is simiar to this issue, and
this might be an option, but it feels a little smelly to me:
parcel-bundler/parcel#1668

For now: I'm copying the file over manually so that the file is
available as expected. Seems hacky, but I think it's currently working.

extensionDirectory/package.json

@@ -29,7 +29,7 @@
     "pretty-up": "npx prettier --write \"./**/*.{js,html,css}\"",
     "pretty-check": "npx prettier --check \"./**/*.{js,html,css}\"",
     "test": "echo \"Error: no test specified\" && exit 1",
-    "copy-assets": "cp -r {manifest.json,images,css} dist",
+    "copy-assets": "cp -r {manifest.json,images,css,src/payload.js} dist",
     "watch": "rm -rf dist && mkdir dist && npm run copy-assets && parcel watch src/*.html src/background.js",
     "build": "rm -rf dist && mkdir dist && npm run copy-assets && parcel build src/*.html src/background.js"
   },