Many bug fixes and improvements (#1270)

* Add Ruby and Kotlin icons
Add the avatar of @curtishd

* Update README

* Synchronize zh-hant and zh versions.

* Translate the pythontutor blocks to traditional Chinese

* Fix en/mkdocs.yml

* Update the landing page of the en version.

* Fix the Dockerfile

* Refine the en landingpage

* Fix en landing page

* Reset the README.md

zh-hant/codes/c/chapter_hashing/hash_map_open_addressing.c

@@ -49,6 +49,9 @@ void delHashMapOpenAddressing(HashMapOpenAddressing *hashMap) {
             free(pair);
         }
     }
+    free(hashMap->buckets);
+    free(hashMap->TOMBSTONE);
+    free(hashMap);
 }
 
 /* 雜湊函式 */