Prior to this commit, each app documented its available config props
in its README.adoc. Now that the functions have been moved to the
function catalog, these inline docs are replaced w/ a link to the
respective function catalog docs.
See #524
* Remove `functions` module
* Remove `functions` from build scripts
* Change internal `functions` mentioning in the docs to the dedication Spring Functions Catalog project
* Remove all the TensorFlow modules
* Change to `spring-functions-catalog-bom`
* Update READMEs using `quick-compile.sh`
