feat: add 'exclude_repo' option to stats card (#1450)

This commit allows users to exclude repositories for the stats card
using the `exclude_repo` option.

api/index.js

@@ -29,6 +29,7 @@ module.exports = async (req, res) => {
     bg_color,
     theme,
     cache_seconds,
+    exclude_repo,
     custom_title,
     locale,
     disable_animations,
@@ -50,6 +51,7 @@ module.exports = async (req, res) => {
       username,
       parseBoolean(count_private),
       parseBoolean(include_all_commits),
+      parseArray(exclude_repo),
     );
 
     const cacheSeconds = clampValue(