Add Iceberg Catalog concepts page (#150)
-rw-r--r-- 1239 .asf.yaml
drwxr-xr-x - .github
-rw-r--r-- 128 .gitignore
-rw-r--r-- 103 .gitmodules
-rw-r--r-- 9078 README.md
drwxr-xr-x - docs
drwxr-xr-x - iceberg-theme
drwxr-xr-x - javadoc
drwxr-xr-x - landing-page
drwxr-xr-x - redirects