Fix static files directories

[AngelMunoz]

Describe the bug
importing a json file from the indx file converts the file in a json module, we need to find a way to apply middleware or not

To Reproduce
Steps to reproduce the behavior:
add this to an index.html file

<link rel="manifest" href="./src/manifest.json" />

Expected behavior
sent the json file as json, not as a JS module

maybe using a query param like unpkg?

• ./src/manifest.json?module should return a JS module
• and ./src/manifest.json should return the file as is