Installation Guide: Document Sage installation on Windows via VS Code dev containers #14770

Job	Run time
test-new	11m 46s
test-mod (sagemath_categories-check)	4m 47s
test-long (src/sage/[a-f]*)	34m 4s
test-long (src/sage/[g-o]*)	34m 7s
test-long (src/sage/[p-z]*)	35m 42s
test-long (src/doc src/sage_docbuild src/sage_setup)	15m 32s
coverage-report	15m 24s
	2h 31m 22s

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