Adds apache-beam and neo4j to provider's index (#380)

diff --git a/landing-pages/site/content/en/docs/_index.md b/landing-pages/site/content/en/docs/_index.md
index ab2c0cf..78d040a 100644
--- a/landing-pages/site/content/en/docs/_index.md
+++ b/landing-pages/site/content/en/docs/_index.md
@@ -21,6 +21,8 @@
 
   <li><a href="/docs/apache-airflow-providers-amazon/stable/index.html"><code>Amazon</code></a></li>
 
+  <li><a href="/docs/apache-airflow-providers-apache-beam/stable/index.html"><code>Apache Beam</code></a></li>
+
   <li><a href="/docs/apache-airflow-providers-apache-cassandra/stable/index.html"><code>Apache Cassandra</code></a></li>
 
   <li><a href="/docs/apache-airflow-providers-apache-druid/stable/index.html"><code>Apache Druid</code></a></li>
@@ -91,6 +93,8 @@
 
   <li><a href="/docs/apache-airflow-providers-mysql/stable/index.html"><code>MySQL</code></a></li>
 
+  <li><a href="/docs/apache-airflow-providers-neo4j/stable/index.html"><code>Neo4J</code></a></li>
+
   <li><a href="/docs/apache-airflow-providers-odbc/stable/index.html"><code>ODBC</code></a></li>
 
   <li><a href="/docs/apache-airflow-providers-openfaas/stable/index.html"><code>OpenFaaS</code></a></li>