Improve workshop page UX with dedicated layout and toggle functionality

- 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
- Remove separate workshop-history.md file (integrated into main page)
- Improve user perception that site is actively maintained

Author: Walpurga03

_layouts/workshops.md

@@ -118,7 +118,7 @@ organization.</p>
 function toggleWorkshopHistory() {
   const historyDiv = document.getElementById('workshopHistory');
   const button = document.getElementById('historyToggle');
-  
+
   if (historyDiv.style.display === 'none') {
     historyDiv.style.display = 'block';
     button.innerHTML = '📚 Hide Workshop History';