Improve PyGMT documentation usability and consistency

After redesigning the PyGMT documentation landing page and the project README (#4746), I feel it is a good time to further improve the documentation. Below are some documentation issues and ideas that we can discuss and address. - [ ] Improve version information shown in the footer. At the site footer, the dev version shows "Revision f8d331fd" and the release version shows "Revision v0.19.0". I think it would be clearer to show "Release 0.19.0" instead of "Revision v0.19.0" for release versions. - [ ] Improve the ["Full installation"](https://www.pygmt.org/dev/install.html) page - [ ] Add an introductory note at the beginning, for example: > The "Quickstart" section provides the fastest way to install PyGMT, whereas the following sections provide more detailed, step-by-step instructions for users with different setups or those who want to install the latest development version. - [x] List both required and optional dependencies (#4807). - [ ] Improve the ["PyGMT Ecosystem"](https://www.pygmt.org/dev/ecosystem.html) page - [ ] The page currently starts with "PyGMT provides a Python interface ...", which duplicates the Overview page. Since readers of this page likely already know what PyGMT is, this sentence could be removed. - [ ] The PyGMT Ecosystem includes both dependencies of PyGMT and packages that depend on PyGMT. The current introduction only describes the former, so the wording should be updated. - [ ] The ecosystem figure currently only shows PyGMT dependencies. Consider moving it to the "PyGMT dependencies" section. - [ ] Add GMT as a PyGMT dependency. - [ ] Currently, each package uses its name as a level-3 heading and includes the full official project description. Consider using [MyST definition lists](https://myst-parser.readthedocs.io/en/latest/syntax/typography.html#syntax-glossaries) with shorter descriptions to make the page more concise. - [x] Redesign the ["Presentations"](https://www.pygmt.org/dev/presentations.html) page using the card layout (#4805). - [ ] Improve the ["Changelog"](https://www.pygmt.org/dev/changes.html) page. Contributors are currently listed using Markdown lists, which takes up significant vertical space, especially in the [PDF documentation](https://www.pygmt.org/dev/pygmt-docs.pdf)(~700 pages). Consider using a comma-separated list instead, e.g., `Author1, Author2, Author3`. - [ ] Improve visibility of the PDF documentation. The PDF documentation has been available since v0.15.0 (#1606), although there are still some limitations (#3813). Currently, the dev PDF is available at https://www.pygmt.org/dev/pygmt-docs.pdf, and release PDFs are attached as release assets. Consider ways to make the PDF documentation easier to discover. - [ ] Improve the ["PyGMT Team"](https://www.pygmt.org/dev/team.html) page. The page currently starts with four paragraphs of introductory text, which may be longer than necessary. Consider shortening it or moving some of the content into individual subsections.