Feature/584 tidegauge tutorial

[jpolton]

Pull request checklist

Please check if your PR fulfills the following requirements:

• [ ] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the COAsT-site repo, in a separate PR. See contributing to documentation for details.
• [ ] Build (./build.sh) was run locally and no errors reported
• [ ] Lint (pylint .) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces: - [x] Bugfix - [ ] Feature - [ ] Code style update (formatting, renaming) - [ ] Refactoring (no functional changes, no api changes) - [ ] Build related changes - [x] Documentation content changes - [ ] Other (please describe): ## What is the current behavior?

Old tidegauge tutorial lacks figures and is not very smooth

Issue URL: #584

What is the new behavior?

Improved documentation for tidegauge, as a notebook tutorial. Ironing out some bug in the process

-

Checklist

• [x] Code compiles correctly
• [ ] Created tests which fail without the change (if possible)
• [x] All tests passing
• [ ] Extended the README / documentation, if necessary
• [ ] Added myself / the copyright holder to the AUTHORS file

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Other information