feat: added number of languages param for top langs card (#445)

* feat: num_langs param for top langs

* fix: top-langs card bottom padding with num_langs param

* fix: clamp toplangs num_langs rather than throwing error

* feat: changed param name & fixed minor issues, added tests

Co-authored-by: anuraghazra <hazru.anurag@gmail.com>

api/top-langs.js

@@ -23,6 +23,7 @@ module.exports = async (req, res) => {
     theme,
     cache_seconds,
     layout,
+    langs_count,
   } = req.query;
   let topLangs;
 
@@ -33,7 +34,7 @@ module.exports = async (req, res) => {
   }
 
   try {
-    topLangs = await fetchTopLanguages(username);
+    topLangs = await fetchTopLanguages(username, langs_count);
 
     const cacheSeconds = clampValue(
       parseInt(cache_seconds || CONSTANTS.TWO_HOURS, 10),