Docs: Attributes to remove symlinks

This task removes some files for simplicity and adds attributes to get around the need for symlinks in downstream source for RH docs tooling.

No need to have both stories.adoc and topics.adoc for each title.

Add attributes for community and product:

• :images_dir: resolves to the images directory. For community, images are in the same directory as the main asciidoc file. For product, need to symlink images in the directory for master.adoc.
• :stories: resolves to the directory that contains assembly files. Community this is ../../stories. Product is a symlink to the stories directory.
• :topics: resolves to the directory that contains adoc topic files. Community this is ../../topics. Product is a symlink to the topics directory.