Support for Svelte

[benmccann]

You can look Svelte generated classes like class="svelte-1lhqr8x" as well as looking for the window.__svelte. While these are both typically present, neither are guaranteed to be present, so it's probably worth checking for both.

Here's the wappalyzer detection: https://github.com/dochne/wappalyzer/blob/471c2fb0b093973c098bd1855b89c8cde4997479/src/technologies/s.json#L6929