fix: use GITHUB_ACTIONS env to determine environment

Author: lilrosalyn

svelte.config.js

@@ -1,7 +1,6 @@
 import { mdsvex } from "mdsvex";
 import adapter from "@sveltejs/adapter-static";
 import { vitePreprocess } from "@sveltejs/vite-plugin-svelte";
-import { dev } from "$app/environment";
 
 /** @type {import("@sveltejs/kit").Config} */
 const config = {
@@ -11,7 +10,7 @@ const config = {
 	kit: {
 		adapter: adapter(),
 		paths: {
-			base: dev ? "" : "/site"
+			base: process.env.GITHUB_ACTIONS === "true" ? "/site" : ""
 		}
 	},
 	extensions: [".svelte", ".svx"]