Static site hosting via tangled

Mention no build step

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README.md
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When `cache: false`, the server fetches files from the repo on every request, so it might be slow.
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This library fetches html from the repo directly, so there's no build step. As a workaround, you can add a commit hook to build your site locally and include the built files in your repo (or as a git submodule).
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## To-do
- support `cache: true` in workers