Add js-docs shortcode to ensure consistency between doc and js code (#38316)

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

site/content/docs/5.3/components/alerts.md

@@ -38,28 +38,7 @@ Click the button below to show an alert (hidden with inline styles to start), th
 
 We use the following JavaScript to trigger our live alert demo:
 
-```js
-const alertPlaceholder = document.getElementById('liveAlertPlaceholder')
-
-const alert = (message, type) => {
-  const wrapper = document.createElement('div')
-  wrapper.innerHTML = [
-    `<div class="alert alert-${type} alert-dismissible" role="alert">`,
-    `   <div>${message}</div>`,
-    '   <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>',
-    '</div>'
-  ].join('')
-
-  alertPlaceholder.append(wrapper)
-}
-
-const alertTrigger = document.getElementById('liveAlertBtn')
-if (alertTrigger) {
-  alertTrigger.addEventListener('click', () => {
-    alert('Nice, you triggered this alert message!', 'success')
-  })
-}
-```
+{{< js-docs name="live-alert" file="site/assets/js/snippets.js" >}}
 
 ### Link color
 

site/content/docs/5.3/components/modal.md

@@ -481,24 +481,7 @@ Below is a live demo followed by example HTML and JavaScript. For more informati
 </div>
 {{< /example >}}
 
-```js
-const exampleModal = document.getElementById('exampleModal')
-exampleModal.addEventListener('show.bs.modal', event => {
-  // Button that triggered the modal
-  const button = event.relatedTarget
-  // Extract info from data-bs-* attributes
-  const recipient = button.getAttribute('data-bs-whatever')
-  // If necessary, you could initiate an Ajax request here
-  // and then do the updating in a callback.
-  //
-  // Update the modal's content.
-  const modalTitle = exampleModal.querySelector('.modal-title')
-  const modalBodyInput = exampleModal.querySelector('.modal-body input')
-
-  modalTitle.textContent = `New message to ${recipient}`
-  modalBodyInput.value = recipient
-})
-```
+{{< js-docs name="varying-modal-content" file="site/assets/js/snippets.js" >}}
 
 ### Toggle between modals
 

site/content/docs/5.3/components/toasts.md

@@ -87,17 +87,7 @@ Click the button below to show a toast (positioned with our utilities in the low
 
 We use the following JavaScript to trigger our live toast demo:
 
-```js
-const toastTrigger = document.getElementById('liveToastBtn')
-const toastLiveExample = document.getElementById('liveToast')
-
-if (toastTrigger) {
-  const toastBootstrap = bootstrap.Toast.getOrCreateInstance(toastLiveExample)
-  toastTrigger.addEventListener('click', () => {
-    toastBootstrap.show()
-  })
-}
-```
+{{< js-docs name="live-toast" file="site/assets/js/snippets.js" >}}
 
 ### Translucent
 

site/content/docs/5.3/getting-started/javascript.md

@@ -231,42 +231,7 @@ Tooltips and Popovers use our built-in sanitizer to sanitize options which accep
 
 The default `allowList` value is the following:
 
-```js
-const ARIA_ATTRIBUTE_PATTERN = /^aria-[\w-]*$/i
-const DefaultAllowlist = {
-  // Global attributes allowed on any supplied element below.
-  '*': ['class', 'dir', 'id', 'lang', 'role', ARIA_ATTRIBUTE_PATTERN],
-  a: ['target', 'href', 'title', 'rel'],
-  area: [],
-  b: [],
-  br: [],
-  col: [],
-  code: [],
-  div: [],
-  em: [],
-  hr: [],
-  h1: [],
-  h2: [],
-  h3: [],
-  h4: [],
-  h5: [],
-  h6: [],
-  i: [],
-  img: ['src', 'srcset', 'alt', 'title', 'width', 'height'],
-  li: [],
-  ol: [],
-  p: [],
-  pre: [],
-  s: [],
-  small: [],
-  span: [],
-  sub: [],
-  sup: [],
-  strong: [],
-  u: [],
-  ul: []
-}
-```
+{{< js-docs name="allow-list" file="js/src/util/sanitizer.js" >}}
 
 If you want to add new values to this default `allowList` you can do the following: