eta slots plugin

all credits go to alexkar598, @see

pnpm add eta-slots-plugin

import * as eta from "eta"
import etaSlotsPlugin from "eta-slots-plugin"

eta.configure({
    plugins: [etaSlotsPlugin],
})

layout.eta

<% slot("some-slot") ${ %>
  some default content
<% } %>

child.eta

<% layout("layout") %>

<% content("some-slot") ${ %>
  some slot content
<% } %>