Fetch and index the colllist

[respinos]

Mostly about indexing the collection feed into a pagefind index.

• sets up the colllist.json data source to fetch and sort the feed from https://quod.lib.umich.edu/c/collsize/colllist
• configure an eleventy:after event to useindexer.js to build a pagefind index from the feed
• adds app.js to use styles to filter the displayed collection information

Why is indexer.js building HTML documents to feed to pagefind? I think so the collection name could leverage pagefind's ranking of headings higher than other content.

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