Enable the PDF format documentation in the ReadTheDocs site #2876
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Description of proposed changes
This PR enables the PDF documentation in the ReadTheDocs builds. This is the initial and simple effort to address the request in #1606.
After merging the changes into the main branch (PDFs are disabled in PR previews), we will see a PDF download link at the bottom of the sidebar on the ReadTheDocs site (https://pygmt-dev.readthedocs.io/), as shown below:
The screenshot above comes from the PyGMT documentation site built from my own PyGMT fork. The full URL of the site is https://pygmt-test.readthedocs.io/en/latest/, and the direct URL of PDF file is https://pygmt-test.readthedocs.io/_/downloads/en/latest/pdf/.
As you can see, the layout of the PDF documentation is not ideal, but at least it includes everything, and is still useful for offline use.
If approved and merged, I think we should post the link to the PDF documentation in issue #1606 so that users can easily find the PDF file.