docs: Add 404 page with sphinx-notfound-page
#4365
| Job | Run time |
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| 54s | |
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| 1m 26s | |
| 58s | |
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| 1m 39s | |
| 1m 58s | |
| 2m 9s | |
| 2m 48s | |
| 1m 44s | |
| 2m 17s | |
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| 1m 56s | |
| 2m 10s | |
| 2m 34s | |
| 1m 8s | |
| 47s | |
| 38s | |
| 38s | |
| 32m 58s |