DOC Link field User manual

[sabina-talipova]

Description

User guide. This manual consists of two main parts and a short introduction.

• Part One: A quick guide to the default link types available.
• Part two: A short guide on how to work with a link field.

Manual testing steps

Not required

Issues

• User documentation #26

Pull request checklist

• The target branch is correct
  • See picking the right version
• All commits are relevant to the purpose of the PR (e.g. no debug statements, unrelated refactoring, or arbitrary linting)
  • Small amounts of additional linting are usually okay, but if it makes it hard to concentrate on the relevant changes, ask for the unrelated changes to be reverted, and submitted as a separate PR.
• The commit messages follow our commit message guidelines
• The PR follows our contribution guidelines
• Code changes follow our coding conventions
• This change is covered with tests (or tests aren't necessary for this change)
• Any relevant User Help/Developer documentation is updated; for impactful changes, information is added to the changelog for the intended release
• CI is green

[sabina-talipova]

Failed CI step is unrelated to this PR

[GuySartorelli]

LGTM