chore: dependencies and docs update (#16)

* docs(contributing): update poetry install command

* chore: update dependencies

* docs(usage): use magic command for JupyterLite

* fix: bump ipywidgets to next major version

* feat: support from Python 3.8

Author: ElioDiNino

Diff for: CONTRIBUTING.md

@@ -6,7 +6,7 @@
 Install `poetry`
 
 ```bash
-curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python -
+pipx install poetry
 ```
 
 Learn more about poetry at https://python-poetry.org/

Diff for: doc/source/usage.rst

@@ -26,12 +26,11 @@ To upgrade or ensure the most recent version is installed:
 JupyterLite
 +++++++++++
 
-Using the ``piplite`` library:
+Using the ``%pip`` magic command:
 
 .. code-block:: python
 
-   import piplite
-   await piplite.install(["skillsnetwork"])
+   %pip install skillsnetwork
 
 Reading Files From URL
 ----------------------