Update time imputation documentation

[ddahawkins-TUDelft]

Fixes #

Summary of changes in this pull request

• Updated README to describe the new time imputation methods including a representative figure
• Updated config/README to describe the full argument set

Reviewer checklist

• There are no pip dependencies in the module's environment files (workflow/envs/).
• All rules use pathvars (e.g., <results>) in their inputs and outputs.
• The integration test-suite is successful, including:
  • pre-commit.ci tests pass.
  • tests pass for all relevant OS configurations (linux, osx, windows).
• Module documentation is up-to-date, including:
  • INTERFACE.yaml mentions all relevant pathvars and wildcards.
  • README.md describes how to use the module and has the necessary citations.

[irm-codebase]

Looks good to me!

If we add more methods we might need a sub-section describing each one. But for now this looks good enough to communicate what the module is doing transparently.

[irm-codebase]

@all-contributors please add @ddahawkins-TUDelft for docs

[allcontributors]

@irm-codebase

I've put up a pull request to add @ddahawkins-TUDelft! 🎉