Remove milestones from documentation #22155

Job	Run time
CMake (ubuntu-latest)	2m 12s
CMake (macos-latest)	4m 56s
build-mac (3.10) / build-wheels	3m 52s
build-mac (3.11) / build-wheels	2m 42s
build-mac (3.8) / build-wheels	2m 40s
build-linux (3.10) / build-wheels	2m 15s
build-linux (3.8) / build-wheels	2m 7s
build-linux (3.11) / build-wheels	2m 54s
build-linux (3.9) / build-wheels	2m 11s
build-mac (3.9) / build-wheels	3m 30s
Test ert docs (3.11, ubuntu-latest)	2m 11s
test-linux (3.10, ubuntu-latest, unit-tests) / Run ert tests	4m 45s
test-linux (3.10, ubuntu-latest, integration-tests) / Run ert tests	5m 43s
test-linux (3.11, ubuntu-latest, gui-test) / Run ert tests	7m 15s
test-linux (3.11, ubuntu-latest, integration-tests) / Run ert tests	5m 18s
test-linux (3.11, ubuntu-latest, unit-tests) / Run ert tests	4m 19s
test-linux (3.8, ubuntu-latest, gui-test) / Run ert tests	8m 39s
test-linux (3.8, ubuntu-latest, integration-tests) / Run ert tests	6m 1s
test-linux (3.8, ubuntu-latest, unit-tests) / Run ert tests	4m 31s
test-linux (3.9, ubuntu-latest, integration-tests) / Run ert tests	5m 49s
test-linux (3.9, ubuntu-latest, unit-tests) / Run ert tests	4m 32s
test-mac (3.10, macos-latest, integration-tests) / Run ert tests	7m 15s
test-mac (3.10, macos-latest, unit-tests) / Run ert tests	7m 12s
test-mac (3.10, macos-latest, gui-test) / Run ert tests	11m 13s
Publish to PyPI	0s
	1h 54m 2s

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