README.md: Add note on rebuilding venv

Signed-off-by: Michał Kopeć <[email protected]>
Dasharo · Dec 13, 2023 · 23b81b1 · 23b81b1
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@@ -26,6 +26,9 @@ localhost:12345` (the number is random).
 It is crucial at this point to verify that the pages you have changed
 render correctly as HTML in local preview.
 
+If you need to update the environment (for example, if `requirements.txt` was
+updated, just run `rm -r venv` and re-run the steps above.
+
 ### Broken links checker
 
 Currently we are using [lychee](https://github.com/lycheeverse/lychee) a fast,