feat(platform): Use sidebar_title for breadcrumbs (#13402)

Author: mydea

docs/platforms/javascript/config.yml

@@ -1,5 +1,6 @@
 title: Browser JavaScript
 platformTitle: JavaScript
+sidebar_title: JavaScript
 caseStyle: camelCase
 supportLevel: production
 sdk: 'sentry.javascript.browser'

src/components/breadcrumbs/index.tsx

@@ -14,7 +14,7 @@ export function Breadcrumbs({leafNode}: BreadcrumbsProps) {
   for (let node: DocNode | undefined = leafNode; node; node = node.parent) {
     if (node && !node.missing) {
       const to = node.path === '/' ? node.path : `/${node.path}/`;
-      const title = node.frontmatter.platformTitle ?? node.frontmatter.title;
+      const title = node.frontmatter.sidebar_title ?? node.frontmatter.title;
 
       breadcrumbs.unshift({
         to,