[DOCS] Update wh41n dataset, add license for noac47n and wh41n

[eleanorfrajka]

Description:

This PR updates the dataset for wh41n to the latest (v5) and adds the license CC-BY-4.0 to both the wh41n datasets and the noac47n dataset, based on response from Josh Willis (41°N) and Christian Mertens (47°N).

Other small changes:

• in plotters.py change from units in square brackets to units in parentheses.
• in plotters.py add units formatting for "degree_N" to "°N" and "m s-1" to "m/s".

Checklist:

• I have followed the coding conventions.
• I have updated or added tests to cover my changes.
• I have updated the documentation if needed.
• I have run pytest to check that all tests pass.
• I have run pre-commit run --all-files to lint and format the code.

[Copilot]

Pull request overview

This PR updates the wh41n dataset to version 5 and adds CC-BY-4.0 licenses to both wh41n and noac47n datasets based on feedback from the data providers. Additionally, it standardizes units formatting in plots from square brackets to parentheses and adds new unit conversions. Plot filenames are also normalized to lowercase.

Changes:

• Updated wh41n dataset to v5 with new Zenodo record (18238115)
• Added CC-BY-4.0 license to wh41n and noac47n metadata based on data provider feedback
• Changed units formatting in plots from square brackets to parentheses (e.g., "[Sv]" → "(Sv)")
• Added new unit conversions (degree_N → °N, m s-1 → m/s)
• Normalized plot filenames to lowercase with underscores

Reviewed changes

Copilot reviewed 22 out of 56 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/test_readers.py	Updated expected variable name for 41n dataset to match v5 format
notebooks/demo.ipynb	Removed duplicate raw data loading cell
docs/source/reports/*.rst	Updated report files with v5 data, license info, lowercase plot filenames, and processing version
amocatlas/metadata/wh41n.yml	Added CC-BY-4.0 license, v5 version info, and variable mappings for new format
amocatlas/metadata/noac47n.yml	Added CC-BY-4.0 license
amocatlas/data_sources/wh41n.py	Updated Zenodo URLs, improved CSV parsing logic for v5 format
amocatlas/plotters.py	Changed units formatting and added new unit conversions
amocatlas/report.py	Normalized plot filenames to lowercase
.gitignore	Updated patterns for ARGO data files
data/hobbs_willis_amoc41N_tseries_v2025_01.txt	New v5 data file
docs/source/_static/reports/*.png	Updated plot images with lowercase filenames

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