feat: implement breadcrumb component (#508)

* feat: implement breadcrumbs

* style: fix styling, move breadcrumbs to top

* refactor: move `capitalize to `lang.ts``

* refactor: clean breadcrumb generation

* feat: add options to breadcrumbs

* feat: implement `resolveFrontmatterTitle`

* feat: add `hideOnRoot` option

* feat(consistency): capitalize every crumb

* style: add `flex-wrap` to parent container

* refactor: clean `Breadcrumbs.tsx`

* feat(accessibility): use `nav`, add aria label

* style: improve look in popovers by adding margin

* docs: write docs for breadcrumb component

* refactor: collapse `if` condition for hideOnRoot

* chore: add todo for perf optimization

* docs: update introduction

quartz.layout.ts

@@ -15,7 +15,12 @@ export const sharedPageComponents: SharedLayout = {
 
 // components for pages that display a single page (e.g. a single note)
 export const defaultContentPageLayout: PageLayout = {
-  beforeBody: [Component.ArticleTitle(), Component.ContentMeta(), Component.TagList()],
+  beforeBody: [
+    Component.Breadcrumbs(),
+    Component.ArticleTitle(),
+    Component.ContentMeta(),
+    Component.TagList(),
+  ],
   left: [
     Component.PageTitle(),
     Component.MobileOnly(Component.Spacer()),