docs: remove $1M challenge banner (#1769) #97

Job	Run time
Code checks / Actions lint check	33s
Doc checks / Doc checks / Docs check	1m 39s
Code checks / Spell check	5s
Code checks / Lint check / Lint check (3.10)	53s
Code checks / Lint check / Lint check (3.12)	31s
Code checks / Type check / Type check (3.12)	27s
Code checks / Lint check / Lint check (3.11)	23s
Code checks / Type check / Type check (3.14)	31s
Code checks / Lint check / Lint check (3.13)	29s
Code checks / Type check / Type check (3.13)	32s
Code checks / Type check / Type check (3.10)	28s
Code checks / Lint check / Lint check (3.14)	25s
Code checks / Type check / Type check (3.11)	32s
Tests	0s
Changelog update	0s
Release prepare	0s
PyPI publish	0s
Doc release post publish	0s
Doc release / Doc release	2m 14s
	9m 42s

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