fix: add trailing slash to base to generate correct links in PokeNav

related:
https://docs.astro.build/en/guides/upgrade-to/v3/#changed-default-importmetaenvbase_url-trailingslash

Author: Indyandie

package.json

@@ -17,7 +17,7 @@
     "dev": "astro dev",
     "start": "astro dev",
     "build": "astro build --site https://pokeapi.co/",
-    "build:ghpages": "astro build --site https://pokeapi.github.io/ --base pokeapi.co",
+    "build:ghpages": "astro build --site https://pokeapi.github.io --base pokeapi.co/",
     "preview": "astro preview",
     "astro": "astro"
   },