Improve "How to contribute to Silkaj" slides:

- Installing Poetry as pre-release is no longer required
- Clone over http to ease the entry in the project
- Replace bin/silkaj by pyproject.toml to trigger silkaj

public/how_to_contribute_to_silkaj/presentation.md

@@ -225,11 +225,11 @@ class: center, middle
 - On Debian Buster:
 ```bash
 sudo apt install libsodium23 python3-pip python3-venv
-python3 -m pip install poetry --user --pre
+python3 -m pip install poetry --user
 ```
 --
 ```bash
-git clone git@git.duniter.org:clients/python/silkaj.git
+git clone https://git.duniter.org/clients/python/silkaj.git
 cd silkaj
 poetry install
 ```
@@ -335,9 +335,6 @@ template: files
 - `tests/test_*.py`
 --
 
-- `bin/silkaj`
---
-
 - `silkaj/*.py`
 --
 
@@ -367,7 +364,6 @@ image: $DOCKER_IMAGE/$PYTHON_VERSION:latest
 .changes:
   only:
     changes:
-      - bin/silkaj
       - silkaj/*.py
       - tests/*.py
 ```
@@ -418,7 +414,7 @@ name: cicd
 - Release on the *Python Package Index* [PyPI](https://pypi.org/project/silkaj/) and [PyPI test](https://pypi.org/project/silkaj/)
 --
 
-- [Coverage](https://clients.duniter.io/python/silkaj/index.html) on GitLab Pages
+- [Coverage report](https://clients.duniter.io/python/silkaj/index.html) deployed on GitLab Pages
 --
 
 ![DuniterPy pipeline](../images/duniterpy_pipeline.png)
@@ -498,13 +494,11 @@ name: cert
 #### Dive into source files for the `cert` command
 --
 
-- [`bin/silkaj`](https://git.duniter.org/clients/python/silkaj/blob/dev/bin/silkaj):
+- [`pyproject.toml`](https://git.duniter.org/clients/python/silkaj/blob/dev/pyproject.toml):
 
-```python
-from silkaj.cli import cli
-
-if __name__ == "__main__":
-	cli(obj={})
+```toml
+[tool.poetry.scripts]
+silkaj = "silkaj.cli:cli"
 ```
 --