Add SciPy 2022 talk to presentations

[maxrjones]

Description of proposed changes

Adds a link to the SciPy talk in the overview page.

Preview at https://pygmt-dev--2053.org.readthedocs.build/en/2053/overview.html#presentations

Fixes #

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If wrapping a new module, open a 'Wrap new GMT module' issue and submit reasonably-sized PRs.
• If adding new functionality, add an example to docstrings or tutorials.

Slash Commands

You can write slash commands (/command) in the first line of a comment to perform
specific operations. Supported slash commands are:

• /format: automatically format and lint the code
• /test-gmt-dev: run full tests on the latest GMT development version

[weiji14]

Nicely done, thanks again @maxrjones for giving the presentation! It's just outstanding to see how far PyGMT has come along since 2017 😄

[seisman]

Nice presentation!

For this PR, I feel the thumbnail image doc/_static/scipy2022-youtube-thumbnail.png is too large (834 KB) and should not be included in the repo.

[seisman]

For this PR, I feel the thumbnail image doc/_static/scipy2022-youtube-thumbnail.png is too large (834 KB) and should not be included in the repo.

The thumbnail image can be compressed to less than 100 KB using https://squoosh.app/.