Avoid autoscroll when changing tab in tabbed example. (#226)

I think it's a bad UX if the page moves unexpectedly. When looking at
examples, people may want to look at them together with the text leading
to it, and they have to manually scroll back up to.

src/js/06-code.js

@@ -283,23 +283,6 @@ document.addEventListener('DOMContentLoaded', function () {
           el.classList.add(tabActive)
         })
     })
-
-    var toolbarOffset = 0
-    var toolbar = document.querySelector('.toolbar')
-    if (toolbar.offsetHeight) {
-      toolbarOffset = toolbar.offsetHeight
-    }
-    var offset = document.querySelector('.navbar').offsetHeight + toolbarOffset + 20
-
-    var bodyRect = document.body.getBoundingClientRect().top
-    var elementRect = tab.getBoundingClientRect().top
-    var elementPosition = elementRect - bodyRect
-    var offsetPosition = elementPosition - offset
-
-    window.scrollTo({
-      top: offsetPosition,
-      behavior: 'smooth',
-    })
   }
 
   // Tabbed code

src/js/08-tabs-block.js

@@ -63,23 +63,6 @@ document.addEventListener('DOMContentLoaded', function () {
         })
     })
 
-    var toolbarOffset = 0
-    var toolbar = document.querySelector('.toolbar')
-    if (toolbar.offsetHeight) {
-      toolbarOffset = toolbar.offsetHeight
-    }
-    var offset = document.querySelector('.navbar').offsetHeight + toolbarOffset + 20
-
-    var bodyRect = document.body.getBoundingClientRect().top
-    var elementRect = tab.getBoundingClientRect().top
-    var elementPosition = elementRect - bodyRect
-    var offsetPosition = elementPosition - offset
-
-    window.scrollTo({
-      top: offsetPosition,
-      behavior: 'smooth',
-    })
-
     if (sessionStorageAvailable) {
       window.sessionStorage.setItem('code_example_language', lang)
     }