A map of a snake-case names to a import specifiers. The entrypoints
declared here can later be used in the "scripts" option of
PluginRenderResult to load the entrypoint's code on the client.
The render hook is called on the server every time some JSX needs to
be turned into HTML. The render hook needs to call the ctx.render
function exactly once.
The hook can return a PluginRenderResult object that can do things like
inject CSS into the page, or load additional JS files on the client.