SQLite FTS example (#20)

* SQLite FTS example

* refactor: remove via cfg chaining

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Co-authored-by: Joao Goncalves <joao.goncalves01@gmail.com>

internal/examples/shakespeare/README.md

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+## Shake.db
+
+This DB was constructed following this excellent talk: https://www.youtube.com/watch?v=RqubKSF3wig
+
+## Running
+
+It's important to pass the fts5 build tag, or you'll get `no such module: fts5`.
+
+Run with: `go run -tags fts5 main.go`