add astro and configure some things

.eslintrc.cjs

@@ -13,6 +13,7 @@ module.exports = {
   ],
   parserOptions: {
     project: require.resolve("./tsconfig.base.json"),
+    extraFileExtensions: [".astro"],
   },
   overrides: [
     {
@@ -21,5 +22,12 @@ module.exports = {
         project: require.resolve("./packages/website/cypress/tsconfig.json"),
       },
     },
+    {
+      files: ["*.astro"],
+      parser: "astro-eslint-parser",
+      parserOptions: {
+        parser: "@typescript-eslint/parser",
+      },
+    },
   ],
 }