[FLINK-1338] [docs] Remove incubator footer from docs

docs/_includes/footer.md

@@ -18,15 +18,4 @@ under the License.
 -->
 <hr class="divider">
 
-<small>Apache Flink is an effort undergoing incubation at The Apache Software
-Foundation (ASF), sponsored by the Apache Incubator PMC. Incubation is
-required of all newly accepted projects until a further review indicates that
-the infrastructure, communications, and decision making process have
-stabilized in a manner consistent with other successful ASF projects. While
-incubation status is not necessarily a reflection of the completeness or
-stability of the code, it does indicate that the project has yet to be fully
-endorsed by the ASF.</small>
-
-<a href="http://incubator.apache.org/">![Incubator Logo]({{ site.baseurl }}/img/apache-incubator-logo.png)</a>
-
 <p class="text-center"><a href="privacy-policy.html">Privacy Policy<a></p>