Merge pull request #101 from datajoint/pre/v2.0

Landing page improvements and migration guide enhancements

Author: dimitri-yatsenko

mkdocs.yaml

@@ -111,7 +111,7 @@ nav:
   - About:
       - about/index.md
       - History: about/history.md
-      - Platform: about/platform.md
+      - Platform: https://www.datajoint.com/sign-up
       - Citation: about/citation.md
       - Publications: about/publications.md
       - Contributing: about/contributing.md