Run CI (c)make commands in parallel #39

Job	Run time
docs_examples_latex_pdf (cvode)	1m 21s
docs_examples_sphinx_pdf (arkode)	1m 45s
docs_install_guide_pdf	1m 38s
docs_examples_latex_pdf (cvodes)	1m 34s
docs_examples_latex_pdf (ida)	1m 22s
docs_package_pdf (arkode)	3m 49s
docs_package_pdf (cvode)	3m 28s
docs_examples_latex_pdf (idas)	1m 17s
docs_package_pdf (cvodes)	3m 22s
docs_package_pdf (ida)	2m 46s
docs_package_pdf (idas)	3m 25s
docs_examples_latex_pdf (kinsol)	1m 19s
docs_package_pdf (kinsol)	2m 32s
	29m 38s

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