Update package and README (#96)

Author: boundless-forest

README.md

@@ -10,8 +10,9 @@ To build the documentation on your local machine, ensure you have Python and pip
 # Clone the repository.
 git clone https://github.com/darwinia-network/docs.git && docs
 # Install necessary dependencies.
-pip install mkdocs-material mkdocs-git-authors-plugin mkdocs-git-revision-date-localized-plugin
-# View the documentation in your browser at `http://127.0.0.1:8000`.
+poetry install --no-root
+# Build and view the documentation in your browser at `http://127.0.0.1:8000`.
+mkdocs build
 mkdocs serve
 ```