Add the Release and Support diagram and make it visible

Author: dpiparo

_data/navigation.yml

@@ -4,6 +4,9 @@ main:
   - title: "About"
     url: about
     description: "About ROOT"
+  - title: "Releases"
+    url: install/all_releases
+    description: "All ROOT releases"
   - title: "Install"
     url: install
     description: "All you need to download and install ROOT"

assets/images/release_and_support_schedule.png

@@ -7,6 +7,11 @@ sidebar:
   nav: "releases"
 ---
 
+# Release and Support Schedule
+
+<img src="{{'/assets/images/release_and_support_schedule.png' | relative_url}}">
+
+
 <table style="border: 0px ;"><tr>
 <td style="border: 0px"><b><font size="5">{{ page.title }}</font></b></td>
 <td style="border: 0px"><a href="{{ 'feed/releases.xml' | relative_url }}"><img style="width:auto; height:2.0em;" src="{{'/assets/images/feed.svg' | relative_url}}"></a></td>