multiple 'errata' in caldera.apache.org website

https://incubator.apache.org/clutch/caldera.html

https://caldera.apache.org/

Have a look at other Incubator podling web sites to see what the site should include. https://amoro.apache.org/ is one example

• Missing Incubator disclaimer and logo in the footer
• Missing the Apache Software Foundation (ASF) links for sponsorship, events, etc.
• You should try to say 'Apache Caldera' as opposed to Caldera in the text throughout