Fix static file serving for help page and logs page (in npx mode)

[VisargD]

The current help page changes use serveStatic method provided by hono. When executed through npx @portkey-ai/gateway, the CSS and JS script required by the HTML are not getting found because of incorrect relative path.

It is not currently possible to pass absolute path to serveStatic. In order to make the current implementation work, we can move all the CSS and script files into the index.html itself.