Update concept note links and cover image (#299)

Plus add the expression "(beta)" whenever mentioning Open Data Editor.

portal/content/docs/index.mdx

@@ -1,5 +1,5 @@
 ---
-title: Open Data Editor
+title: Open Data Editor (beta)
 description: |
   No-code application to explore and publish all kinds of data:
   datasets, tables, charts, maps, stories, and more.
@@ -26,13 +26,13 @@ hero:
 import { Card, CardGrid } from '@astrojs/starlight/components'
 import About from '../../components/about.astro'
 
-<strong>Open Data Editor (v1)</strong> for early adopters has been released on <strong>
+<strong>Open Data Editor (beta)</strong> for early adopters has been released on <strong>
   Oct 2, 2023
-</strong> -- [READ THE CONCEPT NOTE](https://docs.google.com/presentation/d/1wh3r6fC6gsiUx0tBwon4HT8dqufFV0C5GE6IG4PG7jI/edit)
+</strong> -- [READ THE CONCEPT NOTE](https://docs.google.com/presentation/d/1OJwiQn9PsLyAqtSL04wAq4qhSSSUG4WplJhDbfYE10Y/edit)
 
 ---
 
-[![Concept Note](../../assets/concept-note.png)](https://docs.google.com/presentation/d/1wh3r6fC6gsiUx0tBwon4HT8dqufFV0C5GE6IG4PG7jI/edit)
+[![Concept Note](../../assets/odet-concept-note-new.png)](https://docs.google.com/presentation/d/1OJwiQn9PsLyAqtSL04wAq4qhSSSUG4WplJhDbfYE10Y/edit)
 
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 We are building a world open by design where all knowledge is accessible to everyone