Improve workshop page UX with dedicated layout and fix localization links

- Show current status prominently: no workshops currently scheduled
- Hide historical workshop information (2018-2020) in collapsible section
- Maintain all existing #taproot-workshop anchor links functionality
- Use dedicated layout following Publications pattern for consistency
- Fix broken localization links by removing non-existent language pages
- Improve user perception that site is actively maintained

Author: Walpurga03

_layouts/workshops.md

@@ -6,9 +6,6 @@ layout: default
 
 <div class="localization">
   <a href="/en/workshops/">en</a>
-  {% for lang in site.languages %}
-    | <a href="/{{ lang.code }}/workshops/">{{lang.code}}</a>
-  {% endfor %}
 </div>
 
 <h1 class="post-title">Workshops</h1>