* test(gutenberg-to-portable-text): add transform tests
This adds a bunch of tests, mostly for the transformers but also some
minor edge cases in the inline parser, too.
It also enables `noUnusedLocals` in `tsconfig.json` which caught a
couple of unused things.
* chore: add domain to each
* style: format
* chore: remove some figures
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Co-authored-by: emdashbot[bot] <emdashbot[bot]@users.noreply.github.com>
