Custom block edit path is incorrect in hook_admin_paths() and the configure path is missing from the .info

Updated: Comment #1

Problem/Motivation

This is a sub-issue of #2062715: [META] Many UI/UX issues with custom blocks. to address confusion caused by inconsistent use of the admin UI.

• The path for editing custom blocks is incorrect in hook_admin_paths(), which is very disorienting when editing one from the block admin UI suddenly dumps you into a non-administrative form.
• There is no configuration link for the module defined in its .info.

Proposed resolution

• Add a configuration path for admin/structure/custom-blocks.
• Correct the hook_admin_paths() link.

Remaining tasks

Needs review.

User interface changes

• There is now a configuration option for the custom blocks module.
• Editing a custom block no longer dumps you back in the non-admin theme.

API changes

N/A

Related Issues

• #2062715: [META] Many UI/UX issues with custom blocks.
• #2062439: Provide listing of custom block entities