Add migration guides

Author: louismaximepiton

site/src/content/docs/getting-started/migration-from-boosted.mdx

@@ -41,6 +41,8 @@ From now on, OUDS Web won’t embed Bootstrap elements that are not part of Oran
 
 - <span class="tag tag-small rounded-none tag-negative">Breaking</span> The focus-visible polyfill has been removed. So you no longer need it on your side, and you should replace all the calls to `:focus[data-focus-visible-added]` by `:focus-visible`.
 
+- <span class="tag tag-small rounded-none tag-negative">Breaking</span> jQuery support has been removed from the library.
+
 ## Fonts
 
 OUDS Web doesn’t provide Helvetica Neue font files. Instead, it loads the font from a CDN in order to share the cached files between every project using OUDS Web.

site/src/content/docs/getting-started/migration.mdx

@@ -13,6 +13,10 @@ toc: true
 
 <hr />
 
+### Foundations
+
+- <span class="tag tag-small rounded-none tag-negative">Breaking</span> jQuery support has been removed from the library.
+
 ### Components
 
 #### Footer