Remove polyfill.io usage

[drewbaker]

Due to this: https://sansec.io/research/polyfill-supply-chain-attack

we need to remove the 5 lines used to include it: https://github.com/funkhaus/fuxt/blob/ea7356b428ed2c3b0cd6be24e2587d7df14387f0/nuxt.config.js#L21-26

        script: [
            {
                src: "https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver,smoothscroll&flags=gated",
                body: true
            }
        ]

we also need to remove any use of https://www.npmjs.com/package/nuxt-polyfill / nuxt-polyfill from package.json and in nuxt-config:

    /*
     ** Polyfills
     */
    polyfill: {
        features: [
            {
                require: "intersection-observer",
                detect: () => "IntersectionObserver" in window
            },
            {
                require: "smoothscroll-polyfill",
                detect: () =>
                    "scrollBehavior" in document.documentElement.style &&
                    window.__forceSmoothScrollPolyfill__ !== true,
                install: smoothscroll => smoothscroll.polyfill()
            }
        ]
    },

google ads will start delisting sites that have this vulnerability

[drewbaker]

Closed with https://github.com/funkhaus/fuxt/commit/8c8fd1dc96076c034f998eccc4afbd96e9360f39