Migrating cart spec guide topics

[Bilhar-rh]

No description provided.

[nhr]

Couple of thoughts:

1. Probably better not to use specific distribution names outside of an ifdef/endif block. I will create a macro for when the product name appears in the text, but in the case of anchors such as this, it is probably best to stick with 'openshift'.
2. Please don't use Camel_Case, stick to lower case for system things like link anchors.
3. This link anchor is separated from the related header (below) by two blank lines. Please put link anchors directly above the relevant line for clarity.

[Bilhar-rh]

Actually, I've been wondering.....do we need those link anchors? I couldn't link to a section without them.

[nhr]

There are several places in the pull request where the issues that I pointed out occur. Please update the docs with those changes and update this PR by pushing another commit to your feature branch.

Also - since you're adding a new topic group to the docs, please also include the relevant changes to _build_cfg.yml. The build system doesn't know about the new docs until they are added to that yml file.

[Bilhar-rh]

Fixed the issues that were highlighted, and updated the _build_cfg.yml file.