Static site hosting via tangled

Update readme

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README.md
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KNOT_DOMAIN=knot.gracekind.net
OWNER_DID=did:plc:p572wxnsuoogcrhlfrlizlrb
REPO_NAME=tangled-pages-example
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BRANCH=main
```
Run server:
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## Limitations
It fetches files from the repo on request, so it might be slow.
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In the future, we could cache the files and use a CI to update the cache.
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In the future, we could cache the files and use a CI to clear the cache as needed.