update DISCLAIMER (#28)

DISCLAIMER-WIP

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+Apache Gluten (Incubating) 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.
+
+Some of the incubating project’s releases may not be fully compliant with ASF policy.
+For example, releases may have incomplete or un-reviewed licensing conditions.
+What follows is a list of issues the project is currently aware of (this list is likely to be incomplete):
+
+* Releases may have incomplete licensing conditions.
+
+If you are planning to incorporate this work into your product/project, please be aware that you will need to conduct a thorough licensing review to determine the overall implications of including this work. For the current status of this project through the Apache Incubator, visit: https://incubator.apache.org/projects/gluten.html

_includes/footer_custom.html

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   <p class="text-small text-grey-dk-100 mb-0"><a href="https://privacy.apache.org/policies/privacy-policy-public.html">Privacy Policy</a></p>
 
-  <p class="text-small text-grey-dk-100 mb-0">©Intel Corporation.  Intel, the Intel logo, and other Intel marks are trademarks of Intel Corporation or its subsidiaries. All other marks mentioned may be trademarks or registered trademarks of their respective owners.</p>
 {%- endif -%}

index.md

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 Performance varies by use, configuration and other factors. Learn more on the [Performance Index site](https://edc.intel.com/content/www/us/en/products/performance/benchmarks/overview/). Performance results are based on testing as of dates shown in configurations and may not reflect all publicly available updates.  See backup for configuration details.  No product or component can be absolutely secure. Your costs and results may vary. Intel technologies may require enabled hardware, software or service activation. 
 
+© Intel Corporation.  Intel, the Intel logo, and other Intel marks are trademarks of Intel Corporation or its subsidiaries. All other marks mentioned may be trademarks or registered trademarks of their respective owners.
+
 ## Gluten + ClickHouse backend Performance
 
 The below testing environment: a 8-nodes AWS cluster with 1TB data; Spark-3.1.1 for both baseline and Gluten. The Decision Support Benchmark1 result shows an average speedup of 2.12x and up to 3.48x speedup with Gluten Clickhouse backend.