Fix: Always load nojs.css irrespective of build_search_index setting

[welpo]

Currently, the nojs.css file is only loaded when config.build_search_index returns false. This file is responsible for hiding JavaScript elements when JavaScript is disabled in the user's browser.

In practice, this means JavaScript elements like the theme switcher button or the encoded email (in the socials section) are mistakenly visible when JavaScript is disabled, as long as build_search_index is not set to true in config.toml. This is contrary to the expected behavior where these elements should be hidden when JavaScript is disabled, irrespective of the build_search_index setting.

This PR fixes this issue by removing the conditional, effectively ensuring that the nojs.css file is always loaded when JavaScript is disabled. This change aligns the behavior with the intended functionality of hiding specific JavaScript-dependent elements when JavaScript is not enabled.

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[Jieiku]

ah another relic of the past, at one point there was only a couple of js features, and I think I only hid the js search initially.

Thanks for spotting this, appreciate it.

[welpo]

Understandable! I was working on hiding the theme switcher button on my theme, and at first I made it hide by default but become visible with the theme switcher js.

I decided to check out how you did it with abridge and I liked the idea of making it more versatile for possible future additions. So I copied your way of doing it (welpo/tabi@113a7f4) and noticed the issue with build_search_index.