docs: extend integration docs & README (#456)

Signed-off-by: Panos Vagenas <35837085+vagenas@users.noreply.github.com>
Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

docs/overrides/main.html

@@ -1,5 +1,7 @@
 {% extends "base.html" %}
 
+{#
 {% block announce %}
   <p>🎉 Docling has gone v2! <a href="{{ 'v2' | url }}">Check out</a> what's new and how to get started!</p>
 {% endblock %}
+#}