Provide annotations that affect redirections treatment

[Martoon-00]

Clarification and motivation

This is the continuation of #25, here let's think about which annotations (similar to xrefcheck ignore) do we want to see for changing redirections treatment.

We have discussed this topic a bit in #25.

Before starting this ticket, let's also make sure that there is no refactorings in Markdown scanner logic going in parallel.

Acceptance criteria

• We discussed which annotations we provide to modify redirections treatment of the following link / paragraph / file.
  • Annotations should override the behavior specified by the config.
  • However annotations may provide completely different set of options on how to modify the redirection handling.
• The discussed solution is applied.

[Martoon-00]

I'd like #276 to be done first.