WIP: Add topic index for issues

What does this MR do?

Add new doc, per topic: Issues

Are there points in the code the reviewer needs to double check?

Yes, I'll review it with @SeanPackham's help. It's not ready to be merged yet.

Why was this MR needed?

Starting to create a new approach to documentation:

• Introduction/Use-cases
• Tech aspects (the current docs)
• Links to blog posts

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together