Remove stable parameter from installation guide #10368

Job	Run time
Detect which file has changed	6s
action-lint	0s
helm-lint	0s
infrahub-poetry-check	0s
javascript-lint	0s
markdown-lint	10s
python-lint	0s
yaml-lint	0s
backend-tests-integration	0s
backend-benchmark	0s
${{ matrix.name }}	0s
backend-tests-unit	0s
backend-validate-generated	32s
documentation	55s
E2E-testing-playwright	9m 10s
E2E-testing-playwright-nats	9m 0s
validate-documentation-style	8s
frontend-tests	0s
validate-generated-documentation	0s
coverall-report	9s
	20m 10s

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