DAS-2166: Improve HyBIG documentation and notebooks

[flamingbear]

Description

Add information to the HyBIG README regarding default behavior for regridding, tiling, coloring and customizations.

Update example notebook to match current HyBIG functionality

Jira Issue ID

DAS-2166

Local Test Steps

Pull this branch, create a python environment with the packages in docs/requirements.txt Run the notebook and see that all of the output looks correct.

Read the README for clarity and understanding.

Check Notebook for typos or bad wording.

PR Acceptance Checklist

• [X] Jira ticket acceptance criteria met.
• [N/A] CHANGELOG.md updated to include high level summary of PR changes.
• [N/A] docker/service_version.txt updated if publishing a release.
• [N/A] Tests added/updated and passing.
• [X] Documentation updated (if needed).

No release needed since this is only documentation related.

[flamingbear]

• I think the origin of this ticket came from realising what the default behaviour for scale extent wasn't really stated anywhere.

No, but I said I'd put that in.

[flamingbear]

No, but I said I'd put that in.

@owenlittlejohns Ok, I added that information to the README.md I don't think I want to copy it into the notebook. I might update the notebook to alert the reader to a README.md file