microsite: flatten release section

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

docs/releases/overview.md

@@ -1,7 +0,0 @@
----
-id: overview
-title: Overview
-description: Overview of the Backstage Releases
----
-
-Things have been released!

microsite/sidebars.json

@@ -1,14 +1,7 @@
 {
   "releases": {
-    "Releases": [
-      "releases/overview",
-      {
-        "type": "subcategory",
-        "label": "Release Notes",
-        "ids": [
-          "releases/v1.0.0"
-        ]
-      }
+    "Release Notes": [
+      "releases/v1.0.0"
     ]
   },
   "docs": {

microsite/siteConfig.js

@@ -8,6 +8,19 @@
 // See https://docusaurus.io/docs/site-config for all the possible
 // site configuration options.
 
+// This figures out what the most recent release version is, so that we can link to it in the header
+const [{name: latestRelease}] = require('fs').readdirSync(require('path').resolve(__dirname, '../docs/releases')).map(file => {
+  const match = file.match(/^v(\d+)\.(\d+)\.(\d+)\.md$/)
+  if (!match) {
+    return undefined
+  }
+  const parts = match.slice(1).map(v => parseInt(v, 10))
+  return {
+    name: file.slice(0, file.length - '.md'.length),
+    weight: parts[0]*1000000 + parts[1]*1000 + parts[2],
+  }
+}).filter(Boolean).sort((a, b) => b.weight - a.weight);
+
 const siteConfig = {
   title: 'Backstage Software Catalog and Developer Platform', // Title for your website.
   tagline: 'An open platform for building developer portals',
@@ -45,7 +58,7 @@ const siteConfig = {
       label: 'Blog',
     },
     {
-      doc: 'releases/overview',
+      doc: `releases/${latestRelease}`,
       href: '/releases',
       label: 'Releases',
     },