Update config.toml

Since the theme does not include any Search features, may as well not build the search index, the site/theme will compile slightly faster too.

config.toml

@@ -1,6 +1,6 @@
 base_url = "https://not-matthias.github.io/apollo/"
 title = "not-matthias"
-build_search_index = true
+build_search_index = false
 generate_feed = true
 compile_sass = true
 minify_html = true