fix: exclude website/ from the library's tsconfig.build.json

tsconfig.build.json (used by bob build for the published package's type
definitions) declares its own exclude array, which overrides rather than
merges with the base tsconfig.json's exclude — so website/ still leaked
into the definition-file build and broke it with Astro-specific module
errors.

Author: sbaiahmed1

tsconfig.build.json

@@ -1,4 +1,4 @@
 {
   "extends": "./tsconfig",
-  "exclude": ["example", "lib"]
+  "exclude": ["example", "lib", "website"]
 }