Use first heading for page title instead of frontmatter field (#329)

Author: pedrosousa

src/components/docs-page.js

@@ -27,7 +27,7 @@ import getTableOfContents from "../utils/get-table-of-contents"
 import hasBreadcrumbs from "../utils/has-breadcrumbs"
 
 const DocsPage = ({ pageContext: page, children, location }) => {
-  const title = getPageTitle(page)
+  const title = getPageTitle(page, true)
   const pageType = getPageType(page)
   const tableOfContents = getTableOfContents(page)
 

src/utils/get-page-title.js

@@ -1,5 +1,9 @@
-export default ({ frontmatter, headings }) => {
+export default ({ frontmatter, headings }, useHeading=false) => {
   if (!frontmatter) return "Not found"
 
+  if (useHeading) {
+    return (headings.length && headings[0].value) || frontmatter.title
+  }
+
   return frontmatter.title || (headings.length && headings[0].value)
 }