added: new post folder about how i've packaged this repository
with ad hoc env and pdf build process with nix
updated: src/configs/presnterm.yaml, modified to handle additional
arguments in front matter
updated: add a usage and file structure step to the readme
updated: .gitignore to prevent **result** symlink to be commited
removed: unsused file from testings
added flake.nix to provide a build and dev environnement to bootstrap
a venv with presenterm and weasyprint easily
added a package output to flake.nix to build all the posts.
the build process use a python script for easier extensibility
