Figure 3: Remove the sharex/sharey settings

[seisman]

In this PR, I've removed sharex="b", sharey="l" settings from Figure 3. The main reasons are:

• The 3-D perspective image in panel (d) looks a little weird without Y-annotations.
• The main purpose of this example is to show the different base maps that PyGMT can provide, so a shared x- and y-axis is not an important feature.
• The code is shorter
• No need to wait for upstream PR Figure.subplot: Pythonic implemention of the sharex/sharey parameters pygmt#4402

Old	New

@yvonnefroehlich What do you think?

[gitnotebooks]

Found 1 changed notebook. Review the changes at https://app.gitnotebooks.com/GenericMappingTools/pygmt-paper-figures/pull/34

[Copilot]

Pull request overview

This PR updates the Figure 3 PyGMT example notebook to stop sharing subplot axes, improving the readability of axis annotations (notably for the 3-D perspective panel) and simplifying the subplot configuration.

Changes:

• Removed sharex="b" and sharey="l" from the fig.subplot(...) call so each panel manages its own axis annotations.
• Adjusted subplot margins to accommodate the updated framing/annotations.
• Notebook metadata was updated (Python version string).

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[yvonnefroehlich]

Actually, I was thinking a bit about the frame annotations of the 3-D plot when initially creating this figure. It's nice that shared axes are supported by PyGMT, but I agree it looks not optimal here. Maybe we should focus on the base maps here and show frame annotations for all maps frame annotations. But I am currently unsure what is better. What do the others think @michaelgrund, @weiji14?