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.

先检查 js/shell.js 的第 12 行和第 42 行，然后复现 issue 中描述的 localStorage 行为，包括字符串 "false" 的求值方式。确认跨页面加载时预期的历史记录行为，并确保完成的更改不再将存储的 false 值视为 true。

由索引模型根据 Issue 内容生成。