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

overrides/main.html

@@ -6,7 +6,7 @@
 {% elif config.theme.language == 'zh-Hant' %}
     {% set announcements = '紙質書（簡體中文版）已發行，詳情請見<a href="/chapter_paperbook/">這裡</a>' %}
 {% elif config.theme.language == 'en' %}
-    {% set announcements = 'The paper book (Chinese version) published. Please visit <a href="/chapter_paperbook/">this link</a> for more details.' %}
+    {% set announcements = 'Feel free to engage in Chinese-to-English translation and pull request review! Please visit <a href="https://github.com/krahets/hello-algo/issues/914">#914</a> for details.' %}
 {% endif %}
 <div class="banner-svg">
     <svg xmlns="http://www.w3.org/2000/svg"

overrides/stylesheets/extra.css

@@ -519,13 +519,6 @@ a:hover .text-button span {
   .text-button {
     margin: 0.7em auto;
   }
-
-  .profile-div {
-    max-width: 30em;
-  }
-  .profile-cell {
-    flex-basis: 25%;
-  }
 }
 
 .video-container {