Anki add-on: Host Texthooker UI

A very simple addon to host the static HTML version of https://github.com/Renji-XD/texthooker-ui on port 7227. It will start hosting the page immediately upon initializing the addon, and the page can be accessed at any time by using the new option found in Tools > Open Texthooker UI.

GitHub repository: renji-xd/texthooker-ui
Repository description: A web interface for Textractor with websocket plugins
Languages: Svelte, TypeScript, HTML, Nix, JavaScript, CSS