add RSS plugin

make page data configurable
description uses children

Decode pagefind output

Import `nunjucks` with `npm:` specifier

Allow copying custom attributes when replacing an element with the `inline` plugin

remove unneeded code

Allow filename dates to be followed by either an underscore or hyphen

Allows datetime to be separated from remaining slug by either an underscore or hyphen

Run the `inline` plugin on elements within a `<template>` element

refactor: export PluginOptions

make configuring lume with plugin const type safe