Add search functionality

[aaronmbos]

Overview

This PR adds a search feature that allows users to search blog posts. The search will use blog titles, descriptions, content, and metadata to return results to the user.

Technical Decisions

Prior to starting this work, I set a few constraints for what I wanted to accomplish with the search feature.

• If possible, use a free search index service
• Make a minimal search experience that is effective
• Search queries should be shareable via URL

Search index service

I did a bit of research and trialing of different search services, but ultimately decided on Algolia. Algolia has a good reputation and came with the following benefits that were important to me.

• Generous free tier that should support my needs
• Robust API documentation
• UI components (not using them at this point)
• Dashboard to monitor search usage

In my experience so far Algolia has been great and I'm happy I chose them.

Minimal search experience

For this initial release, I wanted to build an effective search experience, but not spend too much time with over-optimization. For example, search results are not paged and there are no autocompletion or search-as-you-type features. These are always features that can be added once I gauge search usage to see if it's worth my time.

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