chore: update the website docs (#6565)

CONTRIBUTING.md

@@ -250,15 +250,9 @@ node scripts/download_dashboards.mjs
 
 ## Contributing to Documentation
 
-When submitting PRs for documentation updates, build and run the documentation locally to ensure functionality before submission. For first time documentation contributors, install the python dependencies with `yarn docs:install`. Build the documentation locally with `yarn docs:build` and serve with `yarn docs:serve`
+When submitting PRs for documentation updates, build and run the documentation locally to ensure functionality before submission. First generate the CLI documentation with `yarn docs:build`. Then in the `docs` folder, build the documentation locally with `yarn install` and serve with `yarn start`.
 
-Your locally served documentation will then be accessible at http://localhost:8000.
-
-If you run into build issues due to circular dependencies, branch switching or other incompatibilities, try cleaning your modules and rebuild your dependencies with:
-
-```sh
-yarn clean && yarn clean:nm && yarn && yarn build
-```
+Your locally served documentation will then be accessible at http://localhost:3000/lodestar/.
 
 We also use a spelling [word list](https://github.com/ChainSafe/lodestar/blob/unstable/.wordlist.txt) as part of our documentation checks. If using unrecognized words or abbreviations, please extend the word list to pass checks. Make sure the list is sorted with `./scripts/wordlist_sort.sh` and checked with `./scripts/wordlist_sort_check.sh` for sorting and duplicates.