Code snippets are missing from the output file

Hey,

Unfortunately `sitefetch` doesn't include in the output files source code included inside ``` blocks.

HTML page contains such code snippet


https://docs.openops.com/getting-started/deployment/local

```
npx sitefetch https://docs.openops.com/getting-started/deployment/local -o docs.txt
cat docs.txt | grep COMPOSE_PARALLEL_LIMIT
```
Doesn't return anything.

Start by running `npx sitefetch https://docs.openops.com/getting-started/deployment/local -o docs.txt` and checking the generated output for `COMPOSE_PARALLEL_LIMIT`. Trace the CLI path that converts the fetched HTML into the text file; done means source code inside fenced blocks is included in the output.

Written by the indexing model from the issue text.