Update README.md with real example for copying #4

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bohne wants to merge 1 commits from bohne/custom-html-tiny:bohne-patch-1 into main

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@ -23,6 +23,6 @@ Custom HTML website, served using thttpd
5. `abra app deploy YOURAPPDOMAIN`
6. Copy your files to the container, using something like
```
abra app YOURAPPDOMAIN cp index.html app:/content
abra app cp YOURAPPDOMAIN index.html app:/var/www/http
```