gh-37056: Installation guide: Show system package commands using sphinx-inline-tabs
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Preview: https://deploy-preview-37056--
sagemath.netlify.app/html/en/installation/source#linux-system-package-
installation
Same for the SPKG pages in the reference manual. https://deploy-
preview-37056--
sagemath.netlify.app/html/en/reference/spkg/gfortran#equivalent-system-
packages
Same for the git instructions in the developer guide, using 2 tabs for
HTTPS and SSH: https://deploy-preview-37056--
sagemath.netlify.app/html/en/developer/github#forking-the-sage-
repository
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### :hourglass: Dependencies
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- Depends on #36957 (merged here)
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URL: https://github.com/sagemath/sage/pull/37056
Reported by: Matthias Köppe
Reviewer(s): Kwankyu Lee
