localStorage usage is buggy

Cool site. Seems the usage of `localStorage` is buggy though. In particular, in this line:

https://github.com/codebytere/codebytere.github.io/blob/3d5854bea758dfe0266b6ffc4b77a0b03a0cb782/js/shell.js#L42

`localStorage.inHistory` will always evaluate to be `true`. That's because everything put into `localStorage` is coerced to a string:

> [The keys and the values are **always strings** (note that, as with objects, integer keys will be automatically converted to strings).](https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage)

So this line:

https://github.com/codebytere/codebytere.github.io/blob/3d5854bea758dfe0266b6ffc4b77a0b03a0cb782/js/shell.js#L12

is actually setting `inHistory` to the string `"false"`, and `Boolean("false") === true`.

Doesn't look like your usage of `localStorage` persists between page loads (everything resets) so there's no real need to use it.

Commencez par inspecter js/shell.js aux lignes 12 et 42, puis reproduisez le comportement de localStorage décrit dans l’issue, notamment la manière dont la chaîne "false" est évaluée. Confirmez le comportement prévu de l’historique lors des chargements successifs de la page et assurez-vous que la modification terminée ne traite plus la valeur false stockée comme true.

Rédigé par le modèle d'indexation à partir du texte de l'issue.