Remove jQuery from docs/repo.

Some of the snippets need to be updated later.

site/docs/4.3/components/scrollspy.md

@@ -264,9 +264,9 @@ Navbar links must have resolvable id targets. For example, a `<a href="#home">ho
 {% include callout.html content=callout type="danger" %}
 
 {% capture callout %}
-#### Non-`:visible` target elements ignored
+#### Non-visible target elements ignored
 
-Target elements that are not [`:visible` according to jQuery](https://api.jquery.com/visible-selector/) will be ignored and their corresponding nav items will never be highlighted.
+Target elements that are not visible will be ignored and their corresponding nav items will never be highlighted.
 {% endcapture %}
 {% include callout.html content=callout type="info" %}
 
@@ -310,7 +310,7 @@ Options can be passed via data attributes or JavaScript. For data attributes, ap
       <td>method</td>
       <td>string</td>
       <td>auto</td>
-      <td>Finds which section the spied element is in. <code>auto</code> will choose the best method get scroll coordinates. <code>offset</code> will use jQuery offset method to get scroll coordinates. <code>position</code> will use jQuery position method to get scroll coordinates.</td>
+      <td>Finds which section the spied element is in. <code>auto</code> will choose the best method get scroll coordinates. <code>offset</code> will use the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect"><code>Element.getBoundingClientRect()</code></a> method to get scroll coordinates. <code>position</code> will use the <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetTop"><code>HTMLElement.offsetTop</code></a> and <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetLeft"><code>HTMLElement.offsetLeft</code></a> properties to get scroll coordinates.</td>
     </tr>
     <tr>
       <td>target</td>