Docs: add NLNET funding #922

Job	Run time
ubuntu_version_tests2 (ubuntu-latest, 3.11)	3m 1s
ubuntu_version_tests (ubuntu-latest, 3.10)	4m 6s
reachable_tests (ubuntu-latest, 3.11)	5m 10s
ubuntu_version_tests (ubuntu-latest, 3.11)	4m 43s
ubuntu_version_tests (ubuntu-latest, 3.12)	4m 41s
version_tests2_mac_win (macos-latest, 3.11)	34s
version_tests2_mac_win (windows-latest, 3.11)	1m 6s
version_tests_mac_win (macos-latest, 3.10)	1m 39s
version_tests_mac_win (macos-latest, 3.11)	1m 34s
version_tests_mac_win (macos-latest, 3.12)	1m 33s
version_tests_mac_win (windows-latest, 3.10)	1m 10s
version_tests_mac_win (windows-latest, 3.11)	1m 5s
version_tests_mac_win (windows-latest, 3.12)	1m 7s
	31m 29s

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